Since we know that the equation has the solutions [tex]x = 4[/tex] and [tex]x = -4[/tex] the value of a could be either [tex]8[/tex] or [tex]-8[/tex] .
What is the product of two factors?We know that the product of two factors is equal to zero only when at least one of the factors is zero.
[tex](x + 4) \ (2x - a) = 0[/tex]
This equation has two factors: [tex](x + 4)[/tex] and [tex](2x - a)[/tex] . We can set each of these factors equal to zero and solve for x to find the values that make the equation true.
Setting [tex](x + 4)[/tex] equal to zero, we get:
[tex]x + 4 = 0[/tex]
[tex]x = -4[/tex]
This means that [tex]-4[/tex] is one of the solutions of the equation.
Setting [tex](2x - a)[/tex] equal to zero, we get:
[tex]2x - a = 0[/tex]
[tex]2x = a[/tex]
[tex]x = a/2[/tex]
This means that [tex]a/2[/tex] is another solution of the equation.
Since we know that the equation has the solutions [tex]x = 4[/tex] and [tex]x = -4[/tex] , we can substitute these values into the expression we found for x in terms of a to get:
[tex]a/2 = 4[/tex] or [tex]a/2 = -4[/tex]
Solving for a in each case, we get:
[tex]a = 8[/tex] or [tex]a = -8[/tex]
Therefore, the value of a could be either [tex]8[/tex] or [tex]-8[/tex] .
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write out the form of the partial fraction decomposition of the function (see example). do not determine the numerical values of the coefficients. (a) x^4 (x^3 + x) / (x^2 – x^4) (b) 4 / x^6 − 8x^3
(a) A/x + Bx + [tex]C/(1 + x) + Dx^2 + Ex/(1 - x) + Fx^2[/tex]
(b)A/x + [tex]B/x^2 + C/x^3[/tex] + D/(x - 2) + [tex]E/(x^2[/tex]+ 2x + 4) + F/(x + 2) + [tex]G/(x^2[/tex] - 2x + 4)
How to find partial fraction?(a) To perform partial fraction decomposition on the function:
[tex](x^4 (x^3 + x)) / (x^2 - x^4)[/tex]
we first factor the denominator:
[tex]x^2 - x^4 = x^2(1 - x^2) = x^2(1 + x)(1 - x)[/tex]
The partial fraction decomposition of the function is:
[tex](x^4 (x^3 + x)) / (x^2 - x^4) = A/x + Bx + C/(1 + x) + Dx^2 + Ex/(1 - x) + Fx^2[/tex]
where A, B, C, D, E, and F are constants to be determined.
How to find partial fraction?(b) To perform partial fraction decomposition on the function:
[tex]4 / (x^6 - 8x^3)[/tex]
we first factor the denominator:
[tex]x^6 - 8x^3 = x^3(x^3 - 8) = x^3(x - 2)(x^2 + 2x + 4)(x + 2)(x^2 - 2x + 4)[/tex]
The partial fraction decomposition of the function is:
[tex]4 / (x^6 - 8x^3)[/tex] = [tex]A/x + B/x^2 + C/x^3[/tex] + D/(x - 2) + [tex]E/(x^2 + 2x + 4) + F/(x + 2)[/tex] + [tex]G/(x^2 - 2x + 4)[/tex]
where A, B, C, D, E, F, and G are constants to be determined.
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temperature different between the warm upper surface of the ocean and the colder deeper level can be utilized to convert thermal energy to mechanical energy. this mechanical energy can in turn be used to produce electrical power using a vapor turbine. let x denote the difference in temperature between the surface of the water and the water at a depth of 1 kilometer. measurements are taken at 15 randomly selected sites in the gulf of mexico. these data result in the following temperature: 22.5 23.8 23.2 22.8 10.1 23.5 24.0 23.2 24.2 24.3 23.3 23.4 23.0 23.5 22.8 a) construct a double stem-and-leaf diagram for these data. b) find the sample mean, sample median, and sample standard deviation for these data. c) note that the starred observation in the data set is very different from the others. it is potential outlier. construct a boxplot for these data to verify that the value 10.1 dose, in fact, qualify as an outlier. d) to see the effect of this outlier, drop it from the data set and calculate the sample mean, median, and standard deviation for the remaining 14 observation. which measure is least affected by the presence of the outlier? do you see why it is desirable to report both the mean and median of a data set?
(a) 22.5 = 22 is the stem and 8 is the leaf., 23.8 = 23 is the stem and 8 is the leaf.(c) 23.2 = 23 is the stem and 2 is the leaf.(d) 22.8 = 22 is the stem and 8 is the leaf.(e) 10.1 = 10 is the stem and 1 is the leaf.(f) 23.5 = 23 is the stem and 5 is the leaf.(g) 24.0 = 24 is the stem and 0is the leaf.(h) 23.2 = 23 is the stem and 2 is the leaf.(g) 24.2 = 24 is the stem and 2 is the leaf.(i) 24.3 = 24 is the stem and 3 is the leaf.(j) 23.3 = 23 is the stem and 3 is the leaf.(k) 23.4 = 23 is the stem and 4 is the leaf.(l) 23.0 = 23 is the stem and 0 is the leaf.(m)23.5 = 23 is the stem and 5 is the leaf.
And (n) 22.8 = 22 is the stem and 8 is the leaf.
(b) Sample Mean = 22.50 and Sample median = 47.4
(c) A box and scatter chart or chart (also called a box chart) is a chart that shows data.
(d) Outliers affect the mean value of the data but have little effect on the median or mode of a given set of data.
(a) Given data set is:
22.5, 23.8, 23.2, 22.8, 10.1, 23.5, 24.0, 23.2, 24.2, 24.3 ,,23.3, 23.4 ,23.0, 23.5, 22.8.
We know some of the facts about stem and leaf diagram:
1) The stem is the first digit or digits;
2) The leaf is the final digit of a value;
3) Each stem can consist of any number of digits; but.
4) Each leaf can have only a single digit.
based on the given information:
(a) 22.5 = 22 is the stem and 8 is the leaf.
(b) 23.8 = 23 is the stem and 8 is the leaf.
(c) 23.2 = 23 is the stem and 2 is the leaf.
(d) 22.8 = 22 is the stem and 8 is the leaf.
(e) 10.1 = 10 is the stem and 1 is the leaf.
(f) 23.5 = 23 is the stem and 5 is the leaf.
(g) 24.0 = 24 is the stem and 0is the leaf.
(h) 23.2 = 23 is the stem and 2 is the leaf.
(g) 24.2 = 24 is the stem and 2 is the leaf.
(i) 24.3 = 24 is the stem and 3 is the leaf.
(j) 23.3 = 23 is the stem and 3 is the leaf.
(k) 23.4 = 23 is the stem and 4 is the leaf.
(l) 23.0 = 23 is the stem and 0 is the leaf.
(m)23.5 = 23 is the stem and 5 is the leaf.
(n) 22.8 = 22 is the stem and 8 is the leaf.
(b) Sample Mean = 22.5+ 23.8 + 23.2+ 22.8+ 10.1+ 23.5+ 24.0+ 23.2+ 24.2+ 24.3 + 23.3+ 23.4 +23.0 + 23.5+ 22.8 ÷ 15
= 22.50
Sample Median = 23.2 + 24.2 ÷ 2
= 47.4
(c) The boxplot is a graphical representation of the data distribution based on five numerical points ("minimum", Q1 [Q1], median, Q3 [Q3], and "Maximum"). It can give you information about its benefits and benefits.
(d) The median is generally a better measure of the center when there are extreme values or outliers because it is not affected by the precise numerical values of the outliers. The mean is the most common measure of the center.
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a) what is 10% of 30?
d) what number is 10% more than 30
a
Answer:
10% of 30
=10/100×30
=3
what is the probability that in a random sample of 17 students from this group, the average height will be between 73 and 75 inches?
In the random sample of 17 students in this group, the probability of the average height being 73-75 inches is about 0.014, or 1.4%.
Let the heights be normally distributed with a mean of 70 inches and a standard deviation of 3 inches.
If we sample 17 students from this group, the distribution of the sample mean will also be approximately normal, with a mean of 70 inches and a standard deviation of 3/sqrt(17) inches (according to the central limit theorem).
This sample average interval can be normalized by the following formula:
z = (x - μ) / (σ / sqrt(n))
where x =sample mean,
μ = population mean,
σ= population standard deviation,
and n = sample size.
For the lower bound of 73 inches, the standardized values are:
z1 = (73 - 70) / (3 / sqrt(17)) ≈ 2.25
For the upper limit of 75 inches, the standardized values are:
z2 = (75 - 70) / (3 / sqrt(17)) ≈ 3.87
Find the probability that the sample mean is between these two values. This probability can be found by finding the area under the standard normal curve between z1 and z2 using a standard normal distribution table or calculator.
P(2.25 < z < 3.87) ≈ 0.014
So, in her random sample of 17 students in this group, the probability of the average height being 73-75 inches is about 0.014, or 1.4%.
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Write the arithmetic series in summation notation.
The arithmetic series can be written in summation notation as:
∑_{i=1}⁶ 5i = 5 + 10 + 15 + 20 + 25 + 30 = 105.
What is arithmetic series?
The sum of a series in which each term is computed from the preceding one by adding and subtracting constants is known as an arithmetic series. Alternately, we could say that an arithmetic progression is a set of numbers where, for every pair of successive terms, the second number is obtained by adding a fixed amount to the first.
The common difference in this arithmetic series is 10 - 5 = 5. Therefore, the nth term of the series is given by a_n = 5n.
The first term of the series is 5, which corresponds to n = 1. The last term is 30, which corresponds to n = 6.
The sum of an arithmetic series can be calculated using the formula: S_n = (n/2)(a_1 + a_n), where S_n is the sum of the first n terms, a_1 is the first term, and a_n is the nth term.
Substituting the values of a_1, a_n, and n, we get:
S_6 = (6/2)(5 + 30) = 3(35) = 105
Therefore, the arithmetic series can be written in summation notation as:
∑_{i=1}⁶ 5i = 5 + 10 + 15 + 20 + 25 + 30 = 105.
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What integer is equivalent to 9\frac{3}{2}[/tex]
Answer:
7.
Step-by-step explanation:
To find what is equivalent to it:
[tex]9\frac{3}{2}[/tex]
You have to simplify it into an improper fraction:
21 / 3
= 7
Answer:
the correct answer is 7 according to me
Circle C is centered at the origin. If Q(10,0) lies on circle C, which of the following points also lies on circle C?
If the point Q(10,0) lies on the circle, then the other points that lie on the circle C are (a) (5 , 5√3) and (b) (6,4).
We know that, if "circle C" is centered at the origin, its equation is of the form ⇒ x² + y² = r², where r is = radius of circle,
We know that point Q(10,0) lies on circle C, so we substitute its coordinates into the equation of the circle to find the value of r:
⇒ 10² + 0² = r²,
⇒ r² = 100,
⇒ r = 10,
So, the equation of circle C is : x² + y² = 100,
Now, we check each of the given points to see which ones lie on the circle:
Option (a) : (5 , 5√3)
⇒ 5² + (5√3)² = 100,
⇒ 25 + 75 = 100,
The point (5 , 5√3)lie on circle.
Option (b) : (6,4)
⇒ 6² + 4² = 100,
⇒ 36 + 16 = 100,
The point (6,4) lies on circle.
Option (c) : (4,5√3)
⇒ 4² + (5√3)² = 100,
⇒ 16 + 75 = 91 ≠ 100,
This point (4,5√3) does not lie on circle.
Option (d) : (3 , √34)
⇒ 3² + (√34)² = 100,
⇒ 43 ≠ 100
This point (3 , √34) does not lie on circle.
Therefore, (a) (5 , 5√3) and (b) (6,4) are the point that "lies-exactly" on the circle.
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The given question is incomplete, the complete question is
Circle C is centered at the origin. If Q(10,0) lies on circle C, which of the following points also lies on circle C?
(a) (5 , 5√3)
(b) (6,4)
(c) (4,5√3)
(d) (3 , √34)
1. what is the value of *(p 2)? 2. what is the value of q - p? 3. is (p > q) true or false? 4. is (*p > *q) true or false?
The following is a conditional statement: If an is true, then b is true. A conditional statement is a statement that can be written in the form “If P then Q,” where P and Q are sentences.
If p, then q, or "p implies q," is the conditional of q by p, and it is symbolised by p q. If both p and q are true, then it is false; otherwise, it is true. Contrapositive: "If q then p" is the opposite of a conditional statement of the form "If p then q."
Has a truth value of true if both a and b are true.
In addition to b's truth value, an is untrue.
if an is true and b is false, and has a truth value of false.
Then, with relation to the following claims:
1. p -> q
This sentence is true because p and q are both true.
2. p -> q
This is a false assertion because p is true and q is false..
3. p->q
Regardless of the truth value of q, this assertion is true because p is false.
4. ∼p -> q
P is the inverse of p. P is false if and only if p is true. And regardless of the truth value of q, this assertion is accurate.
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The complete question is
What is the truth value for the following conditional statement?
1.)
p: true
q: true
p → q
2.)
p: true
q: false
p → q
3.)
p: false
q: false
p → q
4.)
p: true
q: true
∼p → q
Mikey bought a tablet at a discount of 40% off of the original price. If he paid $48, then how much was the original price of the tablet? Hint: What percentage did he actually end up paying? Use that when solving. Group of answer choices $32.00 $12.80 $80.00 $19.20
Answer:
$80.00
Step-by-step explanation:
Price Paid: $48
Discount Received: 40%
Percentage Paid: 100% - 40% = 60%
$48 / 60% = $48/0.6 = $80
Answer:
80.00
Step-by-step explanation:
I don't know why, but you don't need the explanation so I have none.
Graph the function f (x) = 1/2 x + 3
See the graphed function image below.
can yall also help me with this pls I will litterally be so happy!!!!
Answer: u = -15/32 ( check if you can simplify, I didn't)
- subtraction/negative
x multiplication
/ division/fraction bar
Step-by-step explanation:
-8/3u -1/2 = 3/4
+1/2 +1/2
-8/3u = 3/4 + 1/2
x2
3/4 + 2/4
-8/3u = 5/4
x-3/8 x-3/8
u = -15/32
There are 30 people in the group, 20% of them are wearing red. How many people are wearing red?
Answer:
Step-by-step explanation:
13. Calculate the volume of the composite figure. Leave in terms of pi.
Answer: 700π/3 OR 233.33π
Step-by-step explanation:
Volume of Cylinder = [tex]\pi r^2h[/tex]
Volume of Hemisphere = [tex]\frac{2}{3}\pi r^3[/tex]
[tex]V_{c}[/tex] = 5² x 6 x π
[tex]V_{c}[/tex] = 25 x 6 x π
[tex]V_{c}[/tex] = 150π
[tex]V_{h}[/tex] = (2 x 5³ x π) / 3
[tex]V_{h}[/tex] = (2 x 125 x π) / 3
[tex]V_{h}[/tex] = 250π/3
[tex]V_{T}[/tex] = [tex]V_{c}[/tex] + [tex]V_{h}[/tex]
[tex]V_{T}[/tex] = 150π + 250π/3
[tex]V_{T}[/tex] = 700π/3 OR 233.33π
a cylindrical package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross section) of 114 inches. find the dimensions (in inches) of the package of maximum volume that can be sent.
The dimensions of the package of maximum volume that can be sent are approximately 7.8 inches in radius and 21.3 inches in height.
Let's assume that the package has a height 'h' and a radius 'r'. The perimeter of the cross-section of a cylinder is the circumference of the circle plus the height multiplied by two, which can be written as:
Perimeter = 2πr + 2h
Given that the maximum combined length and circumference is 114 inches, we can write:
2πr + 2h + 2r = 114
Simplifying this equation, we get:
πr + h = 57 - r ----(1)
The volume of the cylinder is given by:
[tex]V = πr^2h[/tex]
Now, we can use equation (1) to eliminate 'h' from the volume equation:
[tex]V = πr^2(57 - r - πr)[/tex]
Expanding and simplifying this equation, we get:
[tex]V = πr^3 - π^2r^3/3 + 57πr^2 - 57π^2r[/tex]
To find the dimensions of the package that maximize the volume, we need to find the value of 'r' that maximizes the volume. We can do this by taking the derivative of the volume equation with respect to 'r' and setting it equal to zero:
[tex]dV/dr = 3πr^2 - π^2r^2 + 114πr - 57π^2 = 0[/tex]
Solving for 'r', we get:
r ≈ 7.8 inches
Substituting this value of 'r' back into equation (1), we can find the value of 'h':
h ≈ 21.3 inches
Therefore, the dimensions of the package of maximum volume that can be sent are approximately 7.8 inches in radius and 21.3 inches in height.
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Mrs. Kelley is teaching a 5th grade class. She is standing 6 meters in front of Gabrielle. Leslie is sitting to Gabrielle's right. If Leslie and Mrs. Kelley are 7 meters apart, how far apart are Gabrielle and Leslie? If necessary, round to the nearest tenth.
Gabrielle and Leslie are approximately 3.61 meters apart.
What is Pythagoras theorem?
The hypotenuse's square is equal to the sum of the squares of the other two sides if a triangle has a straight angle (90 degrees), according to the Pythagoras theorem. Keep in mind that BC2 = AB2 + AC2 in the triangle ABC signifies this. Base AB, height AC, and hypotenuse BC are all used in this equation. The longest side of a right-angled triangle is its hypotenuse, it should be emphasized.
We know that Mrs. Kelley is standing 6 meters in front of Gabrielle, and Leslie is sitting to Gabrielle's right. We are also given that Mrs. Kelley and Leslie are 7 meters apart.
From the diagram, we can see that Mrs. Kelley and Gabrielle form a right triangle with Leslie as the vertex. Using the Pythagorean theorem, we can find the distance between Gabrielle and Leslie:
[tex]d^2 = (7)^2 - (6)^2d^2 = 49 - 36d^2 = 13[/tex]
d ≈ 3.61
Therefore, Gabrielle and Leslie are approximately 3.61 meters apart.
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Find the sample space for rolling two 8-sided die.
Find the following probabilities
P (sum = 11)
P (sum < 6)
P ( sum is greater than or equal to 7)
P ( sum is a multiple of 3 or a multiples of 4)
For the given sample space we have the probabilities as follows: 1. P(sum=11) = 6/64 = 3/32 2. P (sum < 6) = 10/64 3. P ( sum is greater than or equal to 7) = 49/64 4. P(sum is a multiple of 3 or a multiple of 4) = 33/64.
What is probability?Probability refers to potential. A random event's occurrence is the subject of this area of mathematics. The range of the value is 0 to 1. Mathematics has included probability to forecast the likelihood of certain events. The degree to which something is likely to happen is basically what probability means. You will understand the potential outcomes for a random experiment using this fundamental theory of probability, which is also applied to the probability distribution.
For the sample space of rolling two 8 sided die we have:
1. P (sum = 11):
The samples that give the sum equal to 11 are:
(3, 8), (4, 7), (5, 6), (6, 5), (7, 4), and (8, 3)
Thus,
P(sum=11) = 6/64 = 3/32
2. P (sum < 6):
(1, 1), (1, 2), (1, 3), (1, 4)
(2, 1), (2, 2), (2, 3)
(3, 1), (3, 2)
(4, 1)
Thus, P (sum < 6) = 10/64
3. P ( sum is greater than or equal to 7):
(1, 6), (1, 7), (1, 8) = 3
(2, 5), (2, 6) (2, 7), (2, 8) = 4
(3, 4), (3, 5) (3, 6) (3, 7) (3, 8) = 5
(4, 3) (4, 4) (4, 5) (4, 6), (4, 7) (4, 8) = 6
(5, 2) (5, 3) (5, 4) (5, 5) (5, 6) (5, 7) (5, 8) = 7
(6, 1) upto (6, 8) = 8
(7, 1) upto (7, 8) = 8
(8, 1) upto (8, 8) = 8
Total = 3 + 4 + 5 + 6 + 7 + 8 + 8 + 8 = 49
Thus, P ( sum is greater than or equal to 7) = 49/64
4. P (sum is a multiple of 3 or a multiple of 4):
Multiple of 3: 3, 6, 9, 12, ........
(1, 2) (1, 5) (1, 8) (2, 1) (2, 4) (2, 7) (3, 1) (3, 3) (3, 6) (4, 2) (4, 5) (4, 8) (5, 1) (5, 4) (5, 7), (6, 3), (6, 6) (7, 2) (7, 5) (7, 8) (8, 1) (8, 4), (8, 7) = 23
Multiple of 4: 4, 8, 12, 16, .........
(1, 3) (1, 7) (2, 2) (2, 6) (3, 1) (3, 5) (4, 4) (4, 8), (5, 3), (5, 7), (6, 2), (6, 6) (7, 1) (7, 5) (8, 4) (8, 8) = 16
Common terms = 6
Thus, P(sum is a multiple of 3 or a multiple of 4) = 23 + 16 - 6 / 64 = 33/64
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a dentist believes that patients with depression have higher rating of tooth pain. in the general population, using a scale of 1-10 with higher values indiciating more pain, the average pain rating for patients with toothaches is 6.6. a sample of 30 patients that show high levels of depression have an average pain rating of 7.2 (variance 0.8). is this dentist's claim supported?
The calculated t-statistic (3.24) is greater than the critical value (1.699), reject the null hypothesis
How to find hypothesis?Identify the null and alternative hypotheses:Since the calculated t-statistic (3.24) is greater than the critical value (1.699), we reject the null hypothesis.
In conclusion, the dentist's claim is supported.
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identify the time being asked
12-hour and 24-hour
3 hrs and 2 mins before 8:40 am
half past three in the afternoon
9 minutes to midnight
quarter after 00:00 H
quarter to 19:00 H
half past 13:00 H
5 to 23:00 H
The time clocks necessarily follow two formats which are 12-hour format and 24-hour format.
Equations12-hour:
half past three in the afternoon
9 minutes to midnight
quarter after 00:00 H (this should be "quarter after 12:00 am")
quarter to 19:00 H
half past 13:00 H
5 to 23:00 H
24-hour:
03:02 before 08:40
15:30
23:51
00:15
18:45
13:30
22:55
What are the different time formats?The most typical time format in the United States, Canada, and some other English-speaking nations is the 12-hour clock. It employs the digits 1 through 12 to represent the hours, and "am" or "pm" to denote morning or afternoon/evening, respectively.
The majority of non-American nations, including most of Europe and the rest of the globe, use the 24-hour clock as their primary time system. The hours are denoted by the digits 0-23, with no distinction made between morning and afternoon/evening.
Decimal time: In some nations, including France, the day is split into ten hours, each hour into one hundred minutes, and each minute into one hundred seconds.
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Which statement best describes the 50% rule?
A. Individuals should save and invest 50% of their income.
B. Individuals should invest 50% of their savings in retirement accounts.
C. Individuals should spend up to only 50% of their medium-term savings then build savings back up.
D. Individuals should build back 50% of the spent savings after 10 years.
The statement that best describes the 50% rule is: C. Individuals should spend up to only 50% of their medium-term savings then build savings back up.
Define the term 50% rule?The 50% rule is a personal finance guideline that suggests individuals should spend no more than 50% of their after-tax income on necessities, such as housing, food, transportation, and utilities.
The 50% rule is a personal finance guideline that suggests individuals should spend no more than 50% of their after-tax income on necessities, such as housing, food, transportation, and utilities. The other 50% should be split between savings and discretionary spending, such as entertainment and travel.
Therefore, the statement that best describes the 50% rule is:
C. Individuals should spend up to only 50% of their medium-term savings then build savings back up.
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Francium is a radioactive element discovered by Marguerite Perey in 1939 and named after her country. Francium has a half-life of 22 minutes.
A) Write an expontential function that models the mass show many grams remain from a 480-gram sample after t minutes.
B) How many grams remain after 2 hours?
A) The exponential function that models the mass show many grams remain from a 480-gram sample after t minutes is G(t) = 22(1/2)^(t/5.5)
B) The grams that remain after 2 hours is 51.42 grams.
What is the definition of half life?A substance's half-life is the amount of time needed for half of a radioactive substance to decay. It is a word that is used in nuclear chemistry to describe how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the amount of time needed for the rate of disintegrations per second of radioactive material in order to reduce by half of its initial value.
Given:
The half-life of goo is 22 minutes/4 = 33.75 minutes
b) A formula for the amount remaining could be ...
G(t) = 22(1/2)^(t/5.5)
c) After 2 hours, the amount remaining is ...
G(120) = 135(1/2)^(47/33.75) ≈ 51.42 . . . grams
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A). After t minutes, the exponential function used to describe the mass remaining from a 480-gram sample is [tex]G(t) = 22(\frac{1}{2} )^{(t/5.5)}[/tex]
B). 51.42 grammes are still there after two hours.
What is the definition of half life?The amount of time required for a radioactive substance to decay by half is known as its half-life. It is a term used in nuclear chemistry to describe how quickly unstable atoms transform into different nuclear species by emitting particles or how long it takes for the rate of radioactive material's disintegrations per second to fall by half of its initial value.
Given:
The half-life of goo is 22 minutes/4 = 33.75 minutes
b) The amount left could be calculated using the method...
[tex]G(t) = 22(\frac{1}{2} )^{(t/5.5)}[/tex]
c) The amount left after two hours is...
[tex]G(120)=135(\frac{1}{2} )^{(\frac{47}{33.5} )}[/tex] ≈ 51.42 . . . grams
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EASY 7TH GRADE MATH NEED DONE TODAY
the tens digit of a 2 digit number is 3 more than twice the units digit. if the digits are reversed, the new number is 54 less than the original number
A two-digit number's tens digit is three times larger than its units digit. Reversing the digits results in a new number that is 54 less than the original. The reversal of the original number is 651, which equals 156.
Let's name the units digit "u" and the tens digit of the original number "t."
From the first statement, we know that:
t = 2u + 3
From the second statement, we know that when the digits are reversed, the new number is 54 less than the original number. Using an equation, we can visualize this:
10u + t = 10t + u - 54
Now we can substitute the first equation (t = 2u + 3) into the second equation:
10u + (2u + 3) = 10(2u + 3) + u - 54
Simplifying this equation, we get:
12u + 33 = 21u - 24
Subtracting 12u from both sides, we get:
33 = 9u - 24
Adding 24 to both sides, we get:
57 = 9u
Dividing both sides by 9, we get:
u = 6
Now we can use the first equation (t = 2u + 3) to find the value of t:
t = 2u + 3 = 2(6) + 3 = 15
Therefore, the original number is 156 (with tens digit 1 and units digit 6) and the reversed number is 651. And indeed, 651 is 54 less than 156.
The complete question is:-
The tens digit of a 2-digit number is 3 more than twice the units digit. if the digits are reversed, the new number is 54 less than the original number. Find the number.
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simplify (x^4+2x^3+2x^2+x)(x+1)^-1
Two parallel lines cut by a transversal
So the angle measure for ∠L is 22.5° when two parallel lines cut by a transversal.
What is transversal?In geometry, a transversal is a line that intersects two or more other lines in a plane. When a transversal intersects two parallel lines, it creates a series of corresponding angles, alternate angles, and interior angles, which have specific relationships and properties.
Here,
Since lines a and b are parallel, we know that alternate interior angles are congruent. Therefore, we have:
∠F = ∠L + 180° - 135°
Simplifying this expression, we get:
∠F = ∠L + 45°
Substituting the value of ∠F as 67.5°, we can solve for ∠L:
67.5° = ∠L + 45°
22.5° = ∠L
The relationship between ∠F and ∠L is that they are supplementary angles, meaning they add up to 180°. This is because they are on opposite sides of the transversal and both intersect with the same parallel lines a and b.
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Complete question:
Two parallel lines cut by a transversal. For our safety, it is important that drivers recognize a stop sign immediately. Stop signs are made with exact side and angle measurements to form a regular octagon. They are red so they are easy to see. The three lines drawn below are straight lines. Lines a and b are parallel. a) The stop sign is a regular octagon, so the measure of ∠F must be 67.5°. What is the angle measure for ∠L? Describe the relationship between ∠F and ∠L. (1 point)
Need help by today quick
Step-by-step explanation:
i dony know the answer of this question
in the counting letters examples, the dictionary used to keep track of letter frequencies uses the count as the key. true false
Answer:
False
Step-by-step explanation:
The answer is False
The given statement is false, as the letters are used as keys in the dictionary.
The dictionary used in counting letters examples to keep track of letter frequencies uses the letters as the key and the count as the value. This means that for each letter encountered in a string, the value corresponding to the key (letter) in the dictionary is incremented by 1.
For example, if the string is "hello", the dictionary would initially be empty, and for each letter encountered in the string, the value for the corresponding key in the dictionary would be incremented by 1, resulting in a dictionary like {"h": 1, "e": 1, "l": 2, "o": 1}.
Therefore, the correct answer is false, as the letters are used as keys in the dictionary.
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How many different possible outcomes are there if you roll a four-sided die in the shape of a pyramid three times?
If you roll a four-sided pyramid-shaped die three times, there are 64 possible outcomes that could occur.
If you roll a four-sided pyramid-shaped die three times, there are 64 possible outcomes that could occur.
A four-sided die in the shape of a pyramid is also called a tetrahedral die, and it has four triangular faces, each with a different number on it.
When rolling this die once, there are four possible outcomes since there are four faces and each face has a different number.
When rolling the die three times, we can use the multiplication principle to find the total number of possible outcomes. According to this principle, the total number of outcomes is equal to the product of the number of outcomes for each roll.
Therefore, the total number of possible outcomes when rolling a tetrahedral die three times is:
4 x 4 x 4 = 64
A pyramid-shaped four-sided die can be rolled three times for a total of 64 potential results.
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What did I do wrong here in my answer?
Answer:
please see the attached I put the answer
Step-by-step explanation:
you answer were correct but you change the sign one of them will be positive.
Find the least-squares regression line y^=b0+b1x through the points
(−2,2),(2,9),(5,13,(7,19),(10,24),
and then use it to find point estimates y^ corresponding to x=1 and x=7.
For x=1, y^ =
For x=7, y^ =
The point estimate for least-squares regression line x=1 is approximately 3.85, and the point estimate for x=7 is approximately 24.02.
What is coefficient of linear regression?In a linear regression, the coefficient of determination (R-squared) is a statistical indicator that shows how much of the variance in the dependent variable is explained by the independent variable (s). Higher values suggest a better fit of the regression line to the data, and it has a value between 0 and 1. R-squared is derived by dividing the regression's sum of squares (SSR) by the sum of all squares (SST).
The least-squares regression line is given by the formula:
b1 = Σ[(xi - x)(yi - y)] / Σ[(xi - x)²]
The means of x and y:
x = (−2 + 2 + 5 + 7 + 10) / 5 = 4.4
y = (2 + 9 + 13 + 19 + 24) / 5 = 13.4
Substituting the value we have:
Σ[(xi - x)(yi - y)] = (-2-4.4)(2-13.4) + (2-4.4)(9-13.4) + (5-4.4)(13-13.4) + (7-4.4)(19-13.4) + (10-4.4)(24-13.4) = 400.8
Σ[(xi - x)²] = (-2-4.4)²+ (2-4.4)² + (5-4.4)² + (7-4.4)² + (10-4.4)² = 86.8
Thus, the value of:
b1 = Σ[(xi - x)(yi - y)] / Σ[(xi - x)²] = 400.8 / 86.8 ≈ 4.617
Now, for y-intercept we have:
b0 = y - b1x = 13.4 - 4.617(4.4) ≈ -0.767
y = -0.767 + 4.617x
Now, the point estimate is:
For x=1, y = -0.767 + 4.617(1) ≈ 3.85
For x=7, y = -0.767 + 4.617(7) ≈ 24.02
Therefore, the point estimate for x=1 is approximately 3.85, and the point estimate for x=7 is approximately 24.02.
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Owen stops at a gas station. He pays for gas and a car wash. The graph shows the total cost of
Owen's stop at the gas station, y, as a function of the number of gallons of gas, z.
The rate of the function is 4 dollars per gallon of gas. 4 is the cost per gallon of gas, and 8 is the fixed cost of the car wash.
What is gallon of gasA gallon of gas = 20 pounds of CO₂!
20 pοunds οf carbοn diοxide are prοduced when 6.3 pοunds οf petrοl are burned.
The twο οxygen atοms accοunt fοr a large pοrtiοn οf the weight οf carbοn diοxide (CO₂) (the O₂). Atοms οf carbοn and hydrοgen are jοined tο fοrm petrοl mοlecules. The carbοn and hydrοgen in the gas mοlecules in petrοl burn apart. H₂O, οr water, is created when twο hydrοgen atοms unite with οne οxygen atοm.
Each petrοl carbοn atοm jοins twο οxygen atοms that are already present in the atmοsphere. It prοduces CO₂.
To find the rate of the function, we need to calculate the slope of the line that represents the total cost of Owen's stop at the gas station as a function of the number of gallons of gas. We can use the slope formula:
slope = (y2 - y1) / (x2 - x1)
where (x1, y1) and (x2, y2) are two points on the line. We can use the coordinates (0, 8) and (7, 36) to calculate the slope:
slope = (36 - 8) / (7 - 0) = 28 / 7 = 4
Therefore, the rate of the function is 4 dollars per gallon of gas.
To find the cost per gallon of gas, we can use the y-intercept of the line, which represents the fixed cost of the car wash. From the graph, we can see that the y-intercept is 8 dollars. Therefore, the gas costs (y - 8) dollars per gallon.
We can write this equation as:
y = 4z + 8
where y is the total cost of Owen's stop at the gas station, z is the number of gallons of gas, 4 is the cost per gallon of gas, and 8 is the fixed cost of the car wash.
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The complete question is:
some one please help me!! i don’t understand how i solve for the hemisphere to get the composite volume??
Find the volume of the following composite figure. Round to the nearest hundredth
The volume of a hemisphere is 66.9cm³
Volume of cube is 768cm³
Composite volume is 834.9cm³
Define Volume of cubeThe volume of a cube is the amount of space enclosed within the boundaries of a cube. A cube is a three-dimensional object with six congruent square faces, all of which meet at right angles. Therefore, the formula for calculating the volume of a cube is:
Volume = side length x side length x side length = side³
Given:
Sides of cube
a=8cm
b=8cm
c=12cm
Radius of hemisphere=4cm
The volume of a hemisphere = (1/3)πr³cubic centimeters.
=1/3×π×4³
=66.9cm³
Volume of cube=a×b×c
=8×8×12
=768cm³
Composite volume=The volume of a hemisphere + Volume of cube
=66.9+768
=834.9cm³
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