(-3x + 2y + z = 0 )
The equation of the plane passing through the origin and containing the vectors \( \left[\begin{array}{c}1 \\ -1 \\ 1\end{array}\right] \) and \( \left[\begin{array}{l}1 \\ 0 \\ 3\end{array}\right] \) can be found by taking the cross product of the two vectors and using the resulting vector as the normal vector of the plane. The cross product of the two vectors is given by:
\( \left[\begin{array}{c}1 \\ -1 \\ 1\end{array}\right] \times \left[\begin{array}{l}1 \\ 0 \\ 3\end{array}\right] = \left[\begin{array}{c}(-1)(3) - (1)(0) \\ (1)(3) - (1)(1) \\ (1)(0) - (1)(-1)\end{array}\right] = \left[\begin{array}{c}-3 \\ 2 \\ 1\end{array}\right] \)
Therefore, the equation of the plane is given by:
\( -3x + 2y + z = 0 \)
This is the equation of the plane passing through the origin and containing the two given vectors.
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Use a cosine sum or difference identity to find the exact value. Cos (5π/12) = _________
The exact value of cos(5π/12), using the cosine summation identity, is (√6 - √2)/4.
The exact value of cos(5π/12) can be found using the cosine sum identity, which is:
cos(a + b) = cosa · cosb - sina · sin b
In this case, we can rewrite 5π/12 as (π/4) + (π/6) and use the identity:
cos(5π/12) = cos[(π/4) + (π/6)] = cos(π/4) · cos (π/6) - sin(π/4) · sin (π/6)
Using the values of cos(π/4) = √2/2, cos(π/6) = √3/2, sin(π/4) = √2/2, and sin(π/6) = 1/2, we can plug them into the equation:
cos(5π/12) = (√2/2) · (√3/2) - (√2/2) · (1/2) = √6/4 - √2/4 = (√6 - √2)/4
Therefore, the exact value of cos(5π/12) is (√6 - √2)/4.
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3a+4b-1 where a = 7 and b =2
Given:-
[tex] \frak{a = 7}[/tex][tex] \: [/tex]
[tex] \frak{b = 2}[/tex][tex] \: [/tex]
Solution:-
[tex] \frak{3a + 4b - 1}[/tex][tex] \: [/tex]
[tex] \frak{3 ( 7 ) + 4( 2 ) - 1}[/tex][tex] \: [/tex]
[tex] \frak{21 + 8 - 1}[/tex][tex] \: [/tex]
[tex] \frak{21 + 7}[/tex][tex] \: [/tex]
[tex] \underline{ \boxed{ \frak{ \purple{ \:28 \: }}}}[/tex][tex] \: [/tex]
hope it helps! :)
Find f(g(x))
f(x)=x^2 g(x)=1/x-1 Enter a,b,c,d, or e. a. 1/x^2-1
b. 1/x-1
c. 1/x^2 -2x+1
d. (1/x^2 -1)^2
e. 1/x^2 - 1
The correct answer is c. 1/x^2 - 2/x + 1.
To find f(g(x)), we need to plug in the function g(x) into the function f(x).
f(x) = x^2
g(x) = 1/x-1
So, f(g(x)) = (1/x-1)^2
Using the distributive property, we can expand this expression:
f(g(x)) = (1/x-1)(1/x-1)
f(g(x)) = 1/x^2 - 1/x - 1/x + 1
f(g(x)) = 1/x^2 - 2/x + 1
Therefore, the correct answer is c. 1/x^2 - 2/x + 1.
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Which table(s) represent(s) a function? A. Table 1 only B. Table 2 only C. Tables 1 and 3 only D. Tables 1, 3, and 4 only
The correct answer is option C. Only Table 1 and Table 3 represent a function.
Each input value should be paired with only one output value, as stated in the definition of a function. Therefore, we must verify that each input value is paired with only one output value in order to determine which tables represent a function.
For each input value, Table 1 contains unique output values and unique input values. As a result, a function is represented by Table 1.
For the same input value (input 1), there are two distinct output values in Table 2. As a result, there is no function represented in Table 2.
For each input value, Table 3 contains unique output values and unique input values. As a result, a function is represented by Table 3.
For the same input value (input -2) in Table 4, there are two distinct output values. Subsequently, Table 4 doesn't address a capability.
Consequently, c is the correct response because Tables 1 and 3 only depict functions.
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Complete Question:
Which table(s) represent(s) a function? A. Table 1 only B. Table 2 only C. Tables 1 and 3 only D. Tables 1, 3, and 4 only
10 Calculate the missing terms of each arithmetic sequence given below. Each row represents an arithmetic sequence in which the first and
the last term are given.
First term
-20
54
10
Second term
Third term
Fourth term
19
105
-14
The required,
(a) The missing terms of the first sequence are -7, 6, and 19.
(b) The missing terms of the second sequence are 71, 88, and 105.
(c) The missing terms of the third sequence are 2, -6, and -14.
Arithmetic progression is the series of numbers that have common differences between adjacent values
To find the missing terms of each arithmetic sequence, we need to use the formula for the nth term of an arithmetic sequence:
an = a₁ + (n - 1)d
where an is the nth term, a₁ is the first term, n is the number of terms, and d is a common difference.
Sequence 1,
a₁ = -20, an = 19
n = ? (unknown)
d = (an - a1) / (n - 1)
19 = -20 + (n - 1)d
39 = (n - 1)d
d = 39 / (n - 1)
We also know that a₂, a₃, and a₄ are missing, and there are four terms in total. Therefore, n = 4.
d = 39 / (4 - 1) = 13
Using the formula, we can now find the missing terms:
a₂ = a₁ + d = -20 + 13 = -7
a₃ = a₂ + d = -7 + 13 = 6
a₄ = a₃ + d = 6 + 13 = 19
So the missing terms of the first sequence are -7, 6, and 19.
Similarly,
The missing terms of the second sequence are 71, 88, and 105.
The missing terms of the third sequence are 2, -6, and -14.
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Consider the following matrix.λ003λ+1201λFind the determinant of the matrix. Find the values ofλfor which the determinant is zero. (Enter your answers as a comma-separated list.)λ=
This equation has two solutions: λ = 0 and λ = -1
The determinant of a matrix is given by the formula:
det(A) = a11(a22a33 - a23a32) - a12(a21a33 - a23a31) + a13(a21a32 - a22a31)
In the given matrix, the values of a11, a22, and a33 are λ, (λ+1), and λ respectively. The values of a12, a13, a21, a23, a31, and a32 are all 0. Substituting these values into the formula for the determinant gives:
det(A) = λ((λ+1)λ - 0) - 0(0 - 0) + 0(0 - 0) = λ^3 + λ^2
To find the values of λ for which the determinant is zero, we can set the determinant equal to zero and solve for λ:
λ^3 + λ^2 = 0
λ^2(λ + 1) = 0
This equation has two solutions: λ = 0 and λ = -1. Therefore, the values of λ for which the determinant is zero are 0 and -1. The answer can be written as a comma-separated list as follows:
λ = 0, -1
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For h(x)=3x+1, find h(2)
Suppose that $$18,000 is deposited for five years at 5% APR. Calculate the interest earned if interest is compounded semiannually. Round your answer to the nearest cent.
The interest earned on a deposit of $18,000 for five years at 5% APR compounded semiannually.
To calculate the interest earned on a deposit of $18,000 for five years at 5% APR compounded semiannually, we will use the compound interest formula:
A = P(1 + r/n)^(nt)
Where:
A = final amount
P = principal amount (initial investment)
r = annual interest rate (as a decimal)
n = number of times interest is compounded per year
t = number of years
Plugging in the given values:
A = 18,000(1 + 0.05/2)^(2*5)
A = 18,000(1.025)^10
A = 23,386.28
To find the interest earned, we subtract the initial investment from the final amount:
Interest earned = A - P
Interest earned = 23,386.28 - 18,000
Interest earned = $5,386.28
Therefore, the interest earned on a deposit of $18,000 for five years at 5% APR compounded semiannually is $5,386.28.
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Convert the following binary (base -2) value into its decimal (base -10) equivalent: (111)_(2)=(?)_(10)
The decimal (base-10) equivalent of the binary (base-2) value (111)_(2) is (7)_(10).
To convert a binary (base-2) value into its decimal (base-10) equivalent, we need to multiply each digit in the binary value by the corresponding power of 2, and then add the results together.
Here is how to do it step-by-step for the given binary value (111)_(2):
1. Start with the rightmost digit (the least significant bit) and work your way to the left:
(1 * 2^0) + (1 * 2^1) + (1 * 2^2)
2. Simplify the powers of 2:
(1 * 1) + (1 * 2) + (1 * 4)
3. Multiply the digits by the powers of 2:
1 + 2 + 4
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Use the given conditions to write an equation for the line in point slope form and in slope-intercept form X-intercept and y-intercept = 1 Write an equation for the line in point-slope form. 4 y 3 ** (Simplify your answer. Use integers or tractions for any numbers in the equation) Write an equation for the line in slope-intercept form. y= (Simplify your answer. Use integers or fractions for any numbers in the equation.)
The equation of the line in slope-intercept form is y = -x + 1
To write an equation for the line in point-slope form, we can use the formula y - y1 = m(x - x1), where m is the slope of the line and (x1, y1) is a point on the line.
Since the x-intercept and y-intercept are both 1, we know that the line passes through the points (1,0) and (0,1).
To find the slope of the line, we can use the formula m = (y2 - y1) / (x2 - x1). Plugging in the coordinates of the two points, we get:
m = (1 - 0) / (0 - 1) = -1
Now we can plug in the slope and one of the points into the point-slope form equation:
y - 0 = -1(x - 1)
Simplifying, we get:
y = -x + 1
This is the equation of the line in point-slope form.
To write the equation in slope-intercept form, we can use the formula y = mx + b, where m is the slope of the line and b is the y-intercept.
We already found the slope to be -1, and the y-intercept is given as 1. So we can plug these values into the slope-intercept form equation:
y = -1x + 1
Simplifying, we get:
y = -x + 1
This is the equation of the line in slope-intercept form.
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Suppose you place $2,500 in an account that will pay annual
interest of 6% compounded quarterly. What will be your balance in
your account after 5 years?
After 5 years, the balance of your account with an initial investment of $2,500, 6% annual interest compounded quarterly, will be $3,325.81. This can be calculated using the following formula:
Balance = P(1 + r/n)nt
Where:
P = Principal Amount
r = Annual Interest Rate
n = Number of Compounding Periods
t = Number of Years
Therefore, for your given example, the equation would be:
Balance = 2500(1 + 0.06/4)4 x 5
Balance = 2500(1.015)20
Balance = 2500(1.32581)
Balance = $3,325.81
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A popular phone company states that teens only use their phones for 1.5 years or less before upgrading to a new phone. Your mother believes that teens only upgrade after 1.5 years. State the null and alternative hypothesis for the scenario using math symbols and words.
The null and alternative hypothesis for the given scenario is (H0: μ ≤ 1.5) and (Ha: μ > 1.5).
What are the null and alternative hypotheses?The null hypothesis states that a population parameter is equal to a value. The null hypothesis is often an initial claim that researchers specify using previous research or knowledge.
Null Hypothesis (H0): The average time that teens use their phones before upgrading is 1.5 years or less (H0: μ ≤ 1.5).
Alternative Hypothesis (Ha): The average time that teens use their phones before upgrading is more than 1.5 years (Ha: μ > 1.5).
In words, the null hypothesis states that the average time that teens use their phones before upgrading is 1.5 years or less, which is consistent with the statement made by the phone company.
The alternative hypothesis states that the average time is more than 1.5 years, which is consistent with your mother's belief.
We use the symbol μ to represent the population means of the time that teens use their phones before upgrading.
Hence, the null and alternative hypothesis for the given scenario is (H0: μ ≤ 1.5) and (Ha: μ > 1.5).
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Descriptive statistics and basketball wins: Here are the numbers of wins for the 30 National Basketball Association teams in the 2012–2013 season.
60
44
39
29
23
57
50
43
37
27
49
42
37
29
19
56
51
40
33
26
48
42
31
25
18
53
44
40
29
23
Create a frequency table for the number of wins using the data provided.
What is the Mean, Mode, and Median for the number of wins?
What is the standard deviation and variation?
How many teams had over 41 wins?
What percent of teams scored below 30 wins?
Create a histogram for the number of wins with a normal curve.
Does our data set for age represent a normal curve (somewhat bell-shaped)? If not, is it positively or negatively skewed?
What is the lowest and highest Z-score for wins and make sure to include that in the SPSS data file (2 points)?
What does the Z-score for the number of wins for 37 (2 points)?
The Mean, Mode, and Median for the number of wins are 37.8; 29, 42; 38 respectively. The standard deviation and variation are 11.15 and 124.26 respectively. 9 teams had over 41 wins. 16.67% of teams scored below 30 wins. Our data set for age does not represent a normal curve, it is positively skewed. The lowest and highest Z-score for wins are -1.78 and 1.99 respectively. The Z-score for the number of wins for 37 is -0.07.
To create a frequency table, we need to categorize the number of wins into intervals and count the number of teams in each interval. We can use the following intervals: 15-24, 25-34, 35-44, 45-54, 55-64.
| Interval | Frequency |
|---------|----------|
| 15-24 | 3 |
| 25-34 | 5 |
| 35-44 | 8 |
| 45-54 | 5 |
| 55-64 | 2 |
To calculate the mean, we add up all the values and divide by the number of values:
Mean = (60 + 44 + 39 + 29 + 23 + 57 + 50 + 43 + 37 + 27 + 49 + 42 + 37 + 29 + 19 + 56 + 51 + 40 + 33 + 26 + 48 + 42 + 31 + 25 + 18 + 53 + 44 + 40 + 29 + 23)/30 = 37.8
To find the mode, we look for the value that appears most often. In this case, it is 29 and 42, both appearing twice.
Mode = 29, 42
To find the median, we need to order the values from smallest to largest and find the middle value. If there is an even number of values, we take the average of the two middle values.
Ordered values: 18, 19, 23, 23, 25, 26, 27, 29, 29, 31, 33, 37, 37, 39, 40, 40, 42, 42, 43, 44, 44, 48, 49, 50, 51, 53, 56, 57, 60
Median = (37 + 39)/2 = 38
To calculate the standard deviation, we first find the variance by subtracting the mean from each value, squaring the result, and then taking the average of those squared differences. The standard deviation is the square root of the variance.
Variance = [(60-37.8)^2 + (44-37.8)^2 + ... + (23-37.8)^2]/30 = 124.26
Standard deviation = sqrt(124.26) = 11.15
To find the number of teams with over 41 wins, we can count the values that are greater than 41:
Number of teams with over 41 wins = 9
To find the percent of teams with below 30 wins, we can count the values that are less than 30 and divide by the total number of teams:
Percent of teams with below 30 wins = (5/30)*100 = 16.67%
To create a histogram, we can use the intervals and frequencies from the frequency table and plot them on a graph with the intervals on the x-axis and the frequencies on the y-axis. We can also add a normal curve by calculating the mean and standard deviation and using a normal distribution function.
The data set for the number of wins does not represent a normal curve, as it is slightly positively skewed (there are more values on the lower end of the distribution).
The lowest Z-score is for the value 18, which is (18-37.8)/11.15 = -1.78. The highest Z-score is for the value 60, which is (60-37.8)/11.15 = 1.99.
The Z-score for the value 37 is (37-37.8)/11.15 = -0.07. This means that the value 37 is 0.07 standard deviations below the mean.
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Year 1 Y = 1000+ 0.03 (1000) - 1030.00 Start with the expression for year 1. Recall the identity property of 1 (1000) + 0.03 (1000) = [ ] (1+[ ]) fill in the blanks
The expression by using property is 1000(1+0.03)
What is Number system?A number system is defined as a system of writing to express numbers.
Using the distributive property, we can factor out 1000 from the expression for year 1:
Y = 1000 + 0.03(1000) - 1030.00
= 1000(1 + 0.03) - 1030.00
Using the identity property of 1, we can rewrite (1 + 0.03) as:
(1 + 0.03) = 1.03
Substituting back into the expression for year 1, we get:
Y = 1000(1.03) - 1030.00
Hence, the expression by using property is 1000(1+0.03)
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A cylinder has a base diameter of 12 foot and a height of 12 foot what is its volume in cubic feet to the nearest 10s place
Answer:
Step-by-step explanation:
A cylinder has a base diameter of 12 foot and a height of 12 foot what is its volume in cubic feet to the nearest 10s place
The volume of a cylinder can be calculated using the formula:
V = πr^2h
where:
V is the volume of the cylinder
π is a mathematical constant, approximately equal to 3.14159
r is the radius of the base of the cylinder
h is the height of the cylinder
We are given the diameter of the base, which is 12 feet. The radius (r) is half of the diameter, so we have:
r = 12/2 = 6 feet
The height (h) is also given as 12 feet.
Substituting the values we have into the formula, we get:
V = π(6)^2(12) ≈ 1357.17
Rounding to the nearest 10's place, the volume is approximately 1360 cubic feet. Therefore, the volume of the cylinder is 1360 cubic feet to the nearest 10's place.
PLS Help me it’s due today
Answer: Using 45π cm^3
a) h = 5 cm
b) approximately $2.83
c) h = 9/5 cm
d) approximately $9.90
Step-by-step explanation:
a) The volume of a cylinder is given by the formula [tex]V = \pi r^2h[/tex]. Given that the volume is equal to [tex]45\pi cm^{3}[/tex] and radius is [tex]3cm[/tex], we can plug in.
[tex]45\pi = 3^2h\pi \\45\pi = 9h\pi\\\frac{45\pi }{9\pi } = h\\ h = 5[/tex]
b) Since coffee costs $0.02 per cubic centimeter, and there are [tex]45\pi[/tex] cubic centimeters, 0.02 x [tex]45\pi[/tex] = 2.8274338, and rounding gives $2.83
c) Using the same formula from part a, we plug in [tex]5cm[/tex] for r instead of [tex]3cm[/tex].
[tex]45\pi = 5^2h\pi \\45\pi =25h\pi \\\frac{45\pi }{25\pi } = h\\h = \frac{45}{25} = \frac{9}{5}[/tex]
d) Because hot chocolate powder costs $0.07 per cubic centimeter, and there are [tex]45\pi[/tex] cubic centimeters, 0.07 x [tex]45\pi[/tex] = 9.89601685, and rounding makes it $9.90
Find the surface area of the pyramid. A drawing of a square pyramid. The length of the base is 4. 5 meters. The height of each triangular face is 6 meters. The surface area is square meters
The surface area of the pyramid. A drawing of a square pyramid. The length of the base is 4.5 meters is 74.25 square meters.
To find the area of a pyramid, we need to find the area of the square base and the areas of the four triangular faces, then add them together.
Calculate the area of the base of the square:
The area of the square is the length of one side multiplied by itself, so the area of the base of the square is 4.5 x 4.5 = 20 .25 square meters.
Find the area of each triangle face:
The area of a triangle is the base times the height divided by 2, so the area of each triangle face is 0.5 x 4.5 x 6 = 13.5 square meters.
Add the area of :
The area of the pyramid is the sum of the areas of the square base and the four triangular faces, so the area is 20.25 + 4 x 13.5 = 20.25 + 54 = 74.25 square meters.
The area of the pyramid is therefore 74.25 square meters.
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Test the claim that the proportion of people who own cats is larger than 40% at the 0.025 significance level.
The null and alternative hypothesis would be:
H0:p=0.4H0:p=0.4
H1:p>0.4H1:p>0.4
H0:p=0.4H0:p=0.4
H1:p<0.4H1:p<0.4
H0:μ≥0.4H0:μ≥0.4
H1:μ<0.4H1:μ<0.4
H0:μ≤0.4H0:μ≤0.4
H1:μ>0.4H1:μ>0.4
H0:μ=0.4H0:μ=0.4
H1:μ≠0.4H1:μ≠0.4
H0:p=0.4H0:p=0.4
H1:p≠0.4H1:p≠0.4
The test is:
right-tailed
two-tailed
left-tailed
Based on a sample of 400 people, 43% owned cats
The test statistic is: (to 3 decimals)
The p-value is: (to 4 decimals)
Based on this we:
Fail to reject the null hypothesis
Reject the null hypothesis
a)H0:p=0.4
H1:p>0.4
b)right-tailed test
c)0.075
d)0.0074
e)reject the null hypothesis
In this problem, we are testing the claim that the proportion of people who own cats is larger than 40% at the 0.025 significance level. The null and alternative hypothesis can be written as:
H0:p=0.4
H1:p>0.4
This is a right-tailed test. Using the sample data, the test statistic is 0.075 and the p-value is 0.0074. Therefore, we reject the null hypothesis and conclude that the proportion of people who own cats is greater than 40% at the 0.025 significance level.
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Please help me with step by step explanation, thank you
d
2/3 is the same as 4/6 and 25/100 is the same as 1/4. -1.3 is transferred to the beginning of the equation
Order the following expressions by their values from least to greatest.
-2 a+c b
The expressions ordered from least to greatest are: -2 < b < (a + c)
What is expression?In maths, an expressiοn is a cοmbinatiοn οf numbers, variables, functiοns (such as additiοn, subtractiοn, multiplicatiοn οr divisiοn etc.)
Expressiοns can be thοught οf as similar tο phrases. In language, a phrase οn its οwn may include an actiοn, but it dοesn't make a cοmplete sentence.
According to the question:
-1 < a < 0
2 < b < 3
4 < c < 5
Now, we have the expression a + c
= (-1 < a < 0) + (4 < c < 5)
= (-1 + 4) < (a + c) < (0 + 5)
= 3 < (a + c) < 5
Thus, we have the expressions ordered from least to greatest are:
-2 < 2 < b < 3 < (a + c) < 5
-2 < b < (a + c)
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Complete question:
PLEASE HELP!!!!!!! ASAP PLSSS WHICH ONE IS IT???!
Answer: y = 5/6x
Step-by-step explanation:
It is a direct variation.
\( \begin{aligned} \frac{\sin x+\tan x \cos x}{\tan x} & =\frac{\sin x+\sin x}{\tan x} \\ & =\frac{2 \sin x}{\tan x}\end{aligned} \)
The simplified expression is \(2 \cos x\).
The question is asking us to simplify the expression \( \frac{\sin x+\tan x \cos x}{\tan x} \) and show the steps to reach the final result.
First, we can use the identity \(\tan x = \frac{\sin x}{\cos x}\) to rewrite the expression:
\( \frac{\sin x+\tan x \cos x}{\tan x} = \frac{\sin x+\frac{\sin x}{\cos x} \cos x}{\frac{\sin x}{\cos x}} \)
Next, we can simplify the numerator by canceling out the \(\cos x\) terms:
\( \frac{\sin x+\frac{\sin x}{\cos x} \cos x}{\frac{\sin x}{\cos x}} = \frac{\sin x+\sin x}{\frac{\sin x}{\cos x}} \)
Now, we can combine the \(\sin x\) terms in the numerator:
\( \frac{\sin x+\sin x}{\frac{\sin x}{\cos x}} = \frac{2 \sin x}{\frac{\sin x}{\cos x}} \)
Finally, we can simplify the expression by canceling out the \(\sin x\) terms:
\( \frac{2 \sin x}{\frac{\sin x}{\cos x}} = \frac{2 \sin x}{\sin x} \cdot \frac{\cos x}{1} = 2 \cos x \)
So the final result is:
\( \frac{\sin x+\tan x \cos x}{\tan x} = 2 \cos x \)
Therefore, the simplified expression is \(2 \cos x\).
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According to a survey of workers, 7/25 of them walk to work, 2/25 bike, 4/25 carpool, and 12/25 drive alone. What percent of workers walk or bike to work?
Answer:
Step-by-step explanation:
Make a model
Answer: The answer is 9/25. (36%)
Step-by-step explanation:
Since we know that 7/25 workers walk and 2/25 walk, we can do simple addition to find the total Percentage. This equals 9/25. To find the percentage, do the following:
Write 9/25 into a percentage: Divide
9 / 25 x (100%) = 36%
0.36 (100%) = 36%
Therefore 36% is your answer.
estion list For the given equation, state the value of the discriminant and the number of real sol 36x^(2)-24x+4=0
The value of the discriminant is 0 and the number of real solutions is 1
For the given equation, 36x^(2)-24x+4=0, we can find the value of the discriminant and the number of real solutions using the quadratic formula.
The quadratic formula is x = (-b ± √(b^(2)-4ac))/(2a), where a, b, and c are the coefficients of the equation.
The discriminant is the part of the formula under the square root, b^(2)-4ac.
In this equation, a = 36, b = -24, and c = 4. Plugging these values into the discriminant, we get:
Discriminant = (-24)^(2)-4(36)(4) = 576-576 = 0
Since the discriminant is equal to 0, there is only one real solution to this equation.
Therefore, the value of the discriminant is 0 and the number of real solutions is 1.
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On a nationwide test taken by high school students, the mean score was 51 and the standard deviation was 12. The scores were normally distributed. Complete the following statements
The scores of students were normally distributed.
a)Approximately 68% of the students scored between 40 and 62 .
b) The approximately 95% of the students scored between 29 and 73.
We have a nationwide test taken by high school students, Mean score, μ = 51
Standard deviations, s = 12
The scores were normally distributed, that is
X~ N(M= 51, s = 12)
Lower bound of confidence interval= 40
Upper bound of CI = 62
As we know according to empirical rule the percentage of data falls within one,two and three
standard deviations are 68%,95% and 99.7%
respectively.
a) Mean + standard deviations = 51 + 12 = 63 close to 62
= Upper bound
For 2 standard deviations, 51 + 2×12 = 75
Mean - standard deviations= 51 - 12 = 39 close to 40 = lower bound
For 2 standard deviations, 51 - 2×12 = 27
Thus, data falls within one standard deviation
that is under 68% and so, approximately 68% of students scored between 40 and 62.
b) Similarly, the empirical rule demonstrates that 95% of scores falls within two standard deviation.
mean - 2× standard deviations= 51 - 2× 11
= 51 - 22 = 29
mean + 2× standard deviations= 51 + 2×11
= 51 + 22 = 73
Therefore, approximately 95% of students scored
between 29 and 73.
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Complete question:
On a nationwide test taken by high school students, the mean score was 51 and the standard deviation was 11
The scores were normally distributed. Complete the following statements.
(a) Approximately ?% of the students scored between 40 and 62 .
(b) Approximately 95% of the students scored between ? and ?
what is the vertex for the following quadratic function?
x^2-4x-6
Answer:
vertex = (2, - 10 )
Step-by-step explanation:
given a quadratic function in standard form
ax² + bx + c ( a ≠ 0 )
then the x- coordinate of the vertex is
[tex]x_{vertex}[/tex] = - [tex]\frac{b}{2a}[/tex]
x² - 4x - 6 ← is in standard form
with a = 1 and b = - 4 , then
[tex]x_{vertex}[/tex] = - [tex]\frac{-4}{2}[/tex] = 2
substitute x = 2 into the function for corresponding y- coordinate
2² - 4(2) - 6
= 4 - 8 - 6
= - 10
vertex = (2, - 10 )
1. f(x) = x²+6X-11 Vertex (j)? Access of Symmetry?! X-intercept! Y-intercept! Range ? Domain:?
2. f(x) = x^3 +4x^2 + 10x+12 + Find the zeros!!!
The vertex of the function is (-3, -20), the axis of symmetry is x = -3, the x-intercepts are (-8.44, 0) and (1.44, 0), the y-intercept is (-11), the range is (-∞, -20], and the domain is (-∞, ∞).
To find the vertex, axis of symmetry, x-intercept, y-intercept, range, and domain of the function f(x) = x² + 6x - 11, we can use the following formulas:
- Vertex: (-b/2a, f(-b/2a))
- Axis of symmetry: x = -b/2a
- X-intercept: Solve f(x) = 0
- Y-intercept: f(0)
- Range: All real numbers for a parabola that opens up or down
- Domain: All real numbers
Using these formulas, we can find the following:
- Vertex: (-3, -20)
- Axis of symmetry: x = -3
- X-intercept: (-8.44, 0) and (1.44, 0)
- Y-intercept: (-11)
- Range: (-∞, -20]
- Domain: (-∞, ∞)
Therefore, the vertex of the function is (-3, -20), the axis of symmetry is x = -3, the x-intercepts are (-8.44, 0) and (1.44, 0), the y-intercept is (-11), the range is (-∞, -20], and the domain is (-∞, ∞).
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Find g.
18-√3 in
60°
g
30°
Write your answer in simplest radical form.
The value of g is 9√3 in
What is the radical form?In mathematics, the radical form refers to expressing a mathematical expression or equation using radicals, which are symbolized by the radical sign (√). The radical sign indicates the root of a number, which is a value that when multiplied by itself, produces the original number. The most common type of radical is the square root (√), which represents the positive root of a number.
We have that;
Sin 30 = g/18√3
1/2 = g/18√3
g = 1/2 * 18√3
g = 9√3 in
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PLEASEEE HELP!!!!!!!
Answer:
t=5.2, w=6
Step-by-step explanation:
tan(30)=[tex]\frac{3}{t}[/tex]
[tex]t=\frac{3}{tan(30)} \\t=5.2[/tex]
[tex]sin(30)=\frac{3}{w}\\w=\frac{3}{sin(30)} \\w=6[/tex]
The side w is the hypotenuse and is equal to 6, while f is the adjacent and is equal to 3√3 in radical form and 5.2 expressed as a decimal.
What is trigonometric ratios?The trigonometric ratios is concerned with the relationship of an angle of a right-angled triangle to ratios of two side lengths.
The basic trigonometric ratios includes;
sine, cosine and tangent.
recall that sin30° = 1/2 and cos30° = √3/2
sin 30° = 3/w {opposite/hypotenuse}
w = 3/sin 30° {cross multiplication}
w = 3 ÷ 1/2
w = 3 × 2
w = 6
cos 30° = f/6 {adjacent/hypotenuse}
f = 6 × cos 30° {cross multiplication}
f = 6 × √3/2
f = 3√3
Therefore, the side lengths of w and f of the right triangle are 6 and 3√3 respectively using the trigonometric ratio of sine and cosine of angle 30°.
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