Express in simplest radical form
if a is any integer, is a (a plus 1 )even or odd? say which it is (4 pts) and explain why (as a simple proof) (8 pts).
==================================================
Proof:
We'll break the proof into two cases which I'll label A and B
Case A: 'a' is evenCase B: 'a' is odd-----------
Case A: 'a' is even
k = some integer
a = 2k = some even integer
a+1 = 2k+1
a(a+1) = 2k(2k+1) = 2(2k^2+k) = 2*(some integer)
Since 2 is a factor of that last expression, this shows that a(a+1) is even when 'a' is even.
-----------
Case B: 'a' is odd
k = some integer
a = 2k+1 = some odd integer
a+1 = (2k+1)+1 = 2k+2
a(a+1) = (2k+1)(2k+2) = 2(2k+1)(k+1) = 2(some integer)
This shows that a(a+1) is even when 'a' is odd.
-----------
Therefore, for any integer 'a', the expression a(a+1) is always even.
Some examples:
a = 3, a+1 = 3+1 = 4, a(a+1) = 3*4 = 12 which is evena = 12, a+1 = 12+1 = 13, a(a+1) = 12*13 = 156 which is even-----------
Here's a slightly different way to interpret why the proof works.
a(a+1) consists of factors 'a' and 'a+1'
If 'a' was even, then a(a+1) is automatically even since 2 is a factor of 'a'.If 'a' was odd, then a+1 is even and we arrive at the same conclusion as before.Either way, we'll have 2 as a factor somewhere in a(a+1).
Y is directly proportional to x
When y=30 x=6
work out an equation connecting y and x
The relation between x and y is defined by the equation: y = 5x, where % is constant of the equation and X and Y are variable.
It is given that y varies directly as x. It means y is proportional to x.
y ∝ x
y = kx
{Where k is constant of proportionality.}
It is given that y=30 when x=6. Put x=5 and y=25 in the above equation to find the value of k.
30 = k(6)
Divide both sides by 6.
The value of k is 5.
Hence The relation between x and y is defined by the equation: y = 5x.
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copy and complete the table of values for y=x^2+x what numbers replace a,b and c
Answer:
a = 1, b = 1, c = 0
Step-by-step explanation:
First, we need to find the vertex coordinates:
x (vertex) =
[tex]x(vertex) = \frac{ - b}{2a} = \frac{ - 1}{2 \times 1} = \frac{ - 1}{2} = - 0.5[/tex]
[tex]y(vertex) = { (- 0.5})^{2} + ( - 0.5) = 0.25 - 0.5 = - 0.25[/tex]
Now, that we have the vertex coordinates, we need to pick three x values to either side of the vertex (as I did in the photo)
Pronghorn Co. Has equipment that cost $78,200 and that has been depreciated $49,900. Record the disposal under the following assumptions. It was sold for $19,500. It was sold for $30,800
the disposal under the following assumptions are: To Equipment $78,200
Being equipment is scrapped at a gain
a)
Particulars Debit Credit
Loss on disposal $28,300
Accumulate depreciation of $49,900
To Equipment $78,200
Being equipment scrapped with no value
b)
Particulars Debit Credit
Loss on disposal $8,800
Accumulate depreciation of $49,900
Cash $19,500
To Equipment $78,200
Being equipment disposed of at a loss
c)
Particulars Debit Credit
Accumulate depreciation of $49,900
Cash $30,800
To Gain on disposal $2,500
To Equipment $78,200
Being equipment is scrapped at a gain
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a table shows information about the masses of some dogs what is the minimum number of dogs that could have a mass of 26kg
6 dogs are the bare minimum that might weigh more than 24 kg.
What do minimum and maximum value mean?
Rearrange the function using fundamental algebraic concepts to get the value of x when the derivative equals 0. This response gives the x-coordinate of the function's vertex, which is where the maximum or minimum will occur. To find the minimum or maximum, rewrite the solution into the original function.
For example, if we have a set of numbers {2, 4, 6, 8, 10}, the minimum value is 2 because it is the smallest number in the set, while the maximum value is 10 because it is the largest number in the set.
The minimum of the values present in the interval 20 to 40 is 6
The maximum of the values present in the interval 20 to 40 is (12+6) = 18
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Leila buys candy that costs $7 per pound. She will spend less than $42 on candy. What are the possible numbers of pounds she will buy?
Use p for the number of pounds Leila will buy.
Write your answer as an inequality solved for p.
Answer:
If you spent $56 on candy, she'd buy 8 pounds.
Step-by-step explanation:
a 95 confidence interval for p1-p2 is (-0.185, -0.093). explain how the confidence interval provides the same information as the significance test in part a
We can conclude that the difference between p1 and p2 is statistically significant at the 5% level of significance.
The confidence interval and significance test in part A both provide similar information. The significance test in part A tests if the difference between p1 and p2 is statistically significant, while the confidence interval provides an estimated range of values for the true difference between p1 and p2 with a certain degree of confidence (95% in this case).A confidence interval is a range of values that we believe will include a population parameter with a specified level of confidence.
It can be computed to estimate the population mean or the difference between two population means, such as p1 and p2.In contrast, a significance test assesses whether the difference between two population proportions is statistically significant.
The test calculates a p-value, which is the likelihood of obtaining the observed difference between two proportions, assuming the null hypothesis (that there is no difference between the two proportions) is true. A p-value less than the level of significance (usually 0.05) indicates that the difference between the two proportions is statistically significant, while a p-value greater than the level of significance indicates that the difference is not statistically significant.
Both the confidence interval and the significance test inform us about the difference between two population proportions. The confidence interval provides a range of plausible values for the difference, while the significance test tells us whether the difference is statistically significant or not. In this particular case, since the confidence interval does not contain zero,
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What is the sum of −2^3+x-3 and x^3-3x-4?
(a) Show your work.
(b) Is the sum of −2^3+x-3 and x^3-3x-4 equal to the sum of x^3-3x-4 and -2x^3+x-3? explain.
(a) we can simplify the expression [tex]x^3 - 3x - 4\\[/tex]:
[tex]x^3 - 3x - 4[/tex]
(b) we cannοt simply switch the terms arοund and expect the sum tο be the same.
What is the algebraic expressiοns?An algebraic expressiοn is a mathematical phrase that can cοntain numbers, variables, and οperatοrs, such as additiοn, subtractiοn, multiplicatiοn, and divisiοn.
(a)
The expression [tex]-(2^3)+x-3[/tex] means [tex]-(2^3) + x - 3[/tex] since the expοnent οperatοr (^) has higher precedence than the negatiοn οperatοr (-). Using the οrder οf οperatiοns, we can simplify the expressiοn:
[tex]-2^3+x-3 = -(2^3) + x - 3 = -(8) + x - 3 = x - 11[/tex]
Similarly, we can simplify the expression [tex]x^3 - 3x - 4\\[/tex]:
[tex]x^3 - 3x - 4[/tex]
(b)
The sum of [tex]-2^3+x-3[/tex] and [tex]x^3-3x-4[/tex] is not equal to the sum of [tex]x^3-3x-4[/tex]and [tex]-2x^3+x-3[/tex].This is because additiοn is nοt cοmmutative fοr nοn-like terms, meaning that changing the οrder οf the terms in a sum can change the value οf the sum.
Hence, we cannοt simply switch the terms arοund and expect the sum tο be the same.
We wοuld need tο actually perfοrm the additiοn in bοth cases tο determine if they are equal.
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What is the volume of a sphere with a Demeter of 10 m, rounded to the nearest 10th of a cubic meter 
Thus, the volume of sphere of the diameter of m is found as: 523.33 cu. m.
Explain about the sphere?A sphere is a 3D object that is perfectly round, has a single continuous curving surface, and every point upon that surface is equidistant from the centre.
The distance between each point on its surface and the centre is equal.A sphere is a 3D object that is perfectly round, has a single continuous curving surface, and every point here on surface is equidistant from the centre. The distance between each point on its surface and the centre is equal.volume of a sphere V = ⁴⁄₃πr³.
Demeter = 10 m
Radius r = 10/2 = 5 m
V = ⁴⁄₃ *3.14*(5)³.
V = 523.33
Thus, the volume of a sphere of the diameter of m is found as: 523.33 cu. m.
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evaluate C(4,2)
-6
-12
-24
Answer:
(4,2) represents the number of ways to choose 2 items from a set of 4 distinct items. The formula for C(n,r) is n! / (r! * (n-r)!), where n is the total number of items and r is the number of items being chosen. Plugging in the values for C(4,2), we get: C(4,2) = 4! / (2! * (4-2)!) = 24 / (2 * 2) = 6 Therefore, there are 6 ways to choose 2 items from a set of 4 distinct items.
0 / 350
The value of the given combination C(4, 2) by applying the combination formula in factorial form is equals to option 6.
To evaluate C(4, 2), we use the combination formula, also known as "n choose r" or "C(n, r)",
which calculates the number of ways to choose r items from a set of n distinct items without considering their order. The formula for C(n, r) is:
C(n, r) = n! / (r! × (n - r)!)
Where "!" denotes the factorial of a number, which is the product of all positive integers up to that number.
For example,
4! = 4 × 3 ×2 × 1
= 24.
Now, let's plug the values into the formula for C(4, 2):
C(4, 2) = 4! / (2! × (4 - 2)!)
= 4! / (2! × 2!)
= (4 × 3 × 2 × 1) / ((2 × 1) × (2 × 1))
= (24) / (4)
= 6
Therefore , the value of the combination C(4, 2) equals to option 6.
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i need the answer to all questions
Answer:
here's your answerhope it will help you ( ꈍᴗꈍ)(✿^‿^)(✿^‿^)!!!
your goal is to create a college fund for your child. suppose you find a fund that offers an apr of 7 % . how much should you deposit monthly to accum
So, you need to deposit $628.86 monthly to accumulate $100,000 in 15 years with an APR of 7%.
To create a college fund for your child, you must determine the amount you need to deposit every month. The fund that offers an APR of 7% will help you accumulate the amount in the future. Here are the steps to find out how much you need to deposit monthly.
Step 1: Determine the total amount required for college funds.
The first step is to determine the total amount you need to pay for college funds. Suppose you want to create a college fund for your child that requires $100,000 in 15 years. Use a present value calculator or online present value calculator to determine the future value of the college fund.
Step 2: Determine the interest rate
The second step is to determine the interest rate you will receive on your savings. Suppose the fund offers an APR of 7%.
Step 3: Determine the number of years
The third step is to determine the number of years you have until you need the money. Suppose you have 15 years.
Step 4: Use the annuity formula
The fourth step is to use the annuity formula to determine how much you need to deposit every month. The formula is:
PMT = FV × i / ((1 + i)n - 1)
Where PMT is the monthly payment, FV is the future value, i is the interest rate, and n is the number of payments.
Using the given values:
PMT = 100,000 × 0.07 / ((1 + 0.07)^15 - 1)
PMT = 100,000 × 0.07 / 11.283
PMT = $628.86
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A bottle of juice costs 9.40. If the price of the juice increased by 15%, what is
the new price of the juice after the increase?
Answer:
price of the juice increased by 15%, then the new price of the juice is: New price = Old price + (Percent increase * Old price) Percent increase = 15% Old price = $9.40 New price = $9.40 + (0.15 * $9.40) New price = $9.40 + $1.41 New price = $10.81 Therefore, the new price of the juice after the increase is $10.81.
Find an equation of a circle centred
Center - radius equation for circle of radius r ,centered at (h,k) is :
[tex](x-h)^{2} + (y-k)^{2} = r^{2}[/tex]
you have r = √21
[tex]r^{2} =[/tex] (√21)^2 = 21
centre (h,k) = (0,0) so h =0 and k =0
[tex](x-h)^{2} + (y-k)^{2} = r^{2}[/tex]
[tex](x-0)^{2} + (y -0)^2 = 21[/tex]
[tex]x^{2} + y^{2} = 21[/tex]
If f(x)=√√x-10 +3, which inequality can be used to find the domain of f(x)?
X-
of x=0
O
01/2x20
O
01/x-1020
0zx-104
x-10+320
The inverse of the function y = 16x² + 17 is y = ±√(x - 17)/16
Calculating the inverse of the functionfrom the question, we have the following parameters that can be used in our computation:
y = 16x² + 17
So, we have
x = 16y² + 17
Make y the subject
This gives
y = ±√(x - 17)/16
Hence, the inverse of the function is y = ±√(x - 17)/16
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Backing into a driveway or an alley on the right sidea.is illegal in most states.b. often causes collisions.C.is the safest turnaboutmaneuver.d. should be done only in heavy traffic,Injuries and deaths frommotorcycle collisions are primarily froma.driving too fast.b.the exposed position ofthe rider.c,other vehicles hitting them.d. hitting deer, 21.
Backing into a driveway or an alley on the right side, none of the options are correct
A) Backing into a driveway or alley on the right side is not necessarily illegal in most states. However, some states may have specific laws or regulations related to this maneuver, so it is important to check local laws.
B) Backing into a driveway or alley on the right side can be risky and may increase the likelihood of collisions, particularly if the driver is not paying close attention or if the view is obstructed. However, it does not always cause collisions and may be necessary in certain situations.
C) The safest turnabout maneuver depends on the specific situation and the layout of the road. In some cases, backing into a driveway or alley may be the safest option, while in other situations, a three-point turn or U-turn may be safer.
D) Whether to perform a backing maneuver in heavy traffic depends on the situation. In general, it is advisable to avoid backing up in heavy traffic if possible, as it can increase the risk of collisions. However, if there is no other option, the driver should proceed with caution and take all necessary precautions to ensure safety.
Therefore, the none of the options are correct
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The given question is incomplete, the complete question is:
Backing into a driveway or an alley on the right side a.is illegal in most states b. often causes collisions .c is the safest turn about maneuver d. should be done only in heavy traffic
i need helo what’s the answer to this ASAP!!
This Quadrilateral is a trapezium. And the value of x is 13.
What is Quadrilateral?A quadrilateral is a clοsed figure and it have fοur sides, fοur vertices and fοur angles. In οrder tο create it, fοur nοn-cοllinear pοints are jοined. The sum οf interiοr angles οf quadrilaterals is always equal tο 360 degrees.
As two sides are parallel but not equal of a quadrilateral, it is conspired as trapezium.
Now, it is shown that the two adjacent angles are equal,
when two angles are qual it corresponding opposite side is equal too.
So,
30 = x + 17
Solving for x.
30 = x + 17
x = 30 - 17
x = 13
As x = 13
The longer side = x + 13 = 23 + 13 = 36
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Will mark Brainliest
Solve the exponential equation for x:
7^3-5x=(1/49)^2x+9
Answer:
x = 21
Step-by-step explanation:
Given exponential equation:
[tex]7^{3-5x}=\left(\dfrac{1}{49}\right)^{2x+9}[/tex]
Rewrite 49 as 7²:
[tex]7^{3-5x}=\left(\dfrac{1}{7^2}\right)^{2x+9}[/tex]
[tex]\textsf{Apply the exponent rule:} \quad \dfrac{1}{a^n}=a^{-n}[/tex]
[tex]7^{3-5x}=\left(7^{-2}\right)^{2x+9}[/tex]
[tex]\textsf{Apply the exponent rule:} \quad (a^b)^c=a^{bc}[/tex]
[tex]7^{3-5x}=7^{-2(2x+9)}[/tex]
Simplify the exponent:
[tex]7^{3-5x}=7^{-4x-18}[/tex]
[tex]\textsf{Apply the exponent rule:} \quad a^{f(x)}=a^{g(x)} \implies f(x)=g(x)[/tex]
[tex]3-5x=-4x-18[/tex]
Add 4x to both sides:
[tex]3-5x+4x=-4x-18+4x[/tex]
[tex]3-x=-18[/tex]
Subtract 3 from both sides:
[tex]3-x-3=-18-3[/tex]
[tex]-x=-21[/tex]
Divide both sides by -1:
[tex]x=21[/tex]
Therefore, the value of x is 21.
Answer:
Will mark Brainliest
Solve the exponential equation for x:
7^3-5x=(1/49)^2x+9
in the rhombus below, m<1 = 9x, m<2 = x + y, m<3 =18z find the value of each variable. x = _________ y = _______ z = ______
The value of each variable include the following:
x = 10.
y = 80.
z = 5.
What is a rhombus?In Mathematics and Geometry, a rhombus refers to a type of quadrilateral that is composed of four (4) equal sides and opposite interior angles that are congruent (equal).
Additionally, a rhombus typically has two (2) diagonals that bisect each other at right angles (90 degrees). This ultimately implies that, all of the three angles are 90 degrees;
m∠1 = 9x = 90
9x = 90
x = 90/9
x = 10
m∠2 = y + x = 90
y + x = 90
y + 10 = 90
y = 90 - 10
y = 80
m∠3 = 18z = 90
18z = 90
z = 90/18
z = 5
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Jules owns a square plot of land that measures 30 yards on each side. He plans to divide the land in half by building a fence, as shown by the dotted line below. How many yards of fencing will Jules need?
15 yd
30 yd
30 StartRoot 3 EndRoot yd
30 StartRoot 3 EndRoot yd
Using the Pythagorean theorem, we get,
Jules will need the fencing length of 30√2 yards to build the square fence. Hence, option (c) is correct.
It can be defined as a rectangle whose two adjacent sides are equal. Single regular polygon with equal interior angles, central and exterior angles (90°), and equal diagonal lengths
Given data:
The length of each side of the yard is AB = BC = CD = AD = 30 yards.
As shown by the dotted line, the fencing should be done along the diagonal BD of the given square plot. Then, applying Pythagoras' theorem to find the fencing length BD as,
BD² = BC²+ CD²
Substitute the values as
BD² = 30² + 30²
⇒ BD² = 900+ 900
⇒ BD² = 1800
⇒ BD = √1800
⇒ BD = 30√2 yards.
Thus, we can conclude that Jules will need the fencing length to build the fence along the square plot. Therefore, option (c) is correct.
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Is the function is even, odd, or neither? How do you know?
The function given in graph is an odd function.
What is the definition of a function?
In mathematics, a function is a rule that assigns a unique output to each input in a given set. In other words, a function is a relationship between two sets, called the domain (set of possible inputs) and the range (set of possible outputs), such that each input is paired with exactly one output.
Now,
In mathematics, an even function is a function f(x) that satisfies the following property: f(-x) = f(x) for all values of x in the domain of the function. The graph of an even function is symmetric about the y-axis, meaning that if you fold the graph along the y-axis, the two halves will be identical.
On the other hand, an odd function is a function f(x) that satisfies the following property: f(-x) = -f(x) for all values of x in the domain of the function. In other words, an odd function is symmetric with respect to the origin. The graph of an odd function is symmetric about the origin, meaning that if you rotate the graph 180 degrees about the origin, the graph will look the same.
As we can see the graph will be same when we will rotate it 180°.
Hence,
Given function is odd function.
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Nico tell his mother that he has the opposite of -25 his mother says that she gave his sister money for lunch she has the opposite of $0. how much money do niko and his mother have.
Answer:
Nico has 25 and his mother has 0
Step-by-step explanation:
The opposite of -25 is 25 because -(-25)=25 (the negatives cancle out)
Thats why Nico has 25
The opposite of 0 is 0 because 0 is nothing, you cant have an opposite of negative 0 because that would still be 0
Thats why Nico's mother has 0
PLLS help me with this two. answer like (A).... (B)..... (C)...
(a) The transformation that maps ΔSTU to ΔLMN is a translation of three units to the right and one unit up, followed by a counterclockwise rotation of 90° around the origin
What is transformation?
A dilation with respect to the origin by a scale factor of 1/3.
To map ΔSTU to ΔLMN, we need to perform a combination of transformations: a translation, a rotation, and a dilation.
First, we translate triangle STU three units to the right and one unit up to get triangle S'T'U', where S'(1,3), T'(-2,5), and U'(0,-2).
Next, we rotate triangle S'T'U' 90 degrees counterclockwise around the origin to get triangle S''T''U'', where S''(3,1), T''(-5,2), and U''(2,0).
Finally, we dilate ΔS''T''U'' by a scale factor of 1/3 with respect to the origin to get ΔLMN, where L(1/3,1/3), M(-5/3,2/3), and N(2/3,0).
Therefore, the transformation that maps ΔSTU to ΔLMN is a translation of three units to the right and one unit up, followed by a counterclockwise rotation of 90° around the origin, and finally a dilation with respect to the origin by a scale factor of 1/3.
(b) The side overline SU corresponds to the side overline LN.
(c) Yes, corresponding sides are congruent. the triangles are congruent by the Side-Side-Side (SSS) congruence criterion.
What is congruent?
We can see this by calculating the length of each side of the two triangles:
Length of ST = distance between points S and T = √(((-5) - (-2))² + ((4) - (2))²) = √(10)
Length of LM = distance between points L and M = √(((-5/3) - (1/3))² + ((2/3) - (1/3))²) = √(10)/3
Length of TU = distance between points T and U = √(((-5) - (-3))² + ((4) - (-3))²) = √(74)
Length of MN = distance between points M and N = √(((-5/3) - (2/3))² + ((2/3) - 0)²) = √(10)/3
Length of US = distance between points U and S = √(((-3) - (-2))² + ((-3) - (2))²) = √(26)
Length of NL = distance between points N and L = √(((2/3) - (1/3))² + ((0) - (1/3))²) = √(2)/3
All corresponding sides have the same length, so the triangles are congruent by the Side-Side-Side (SSS) congruence criterion.
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hi!!
pls answer this
worth 93 points!!!
screenshot and circle plsss
Answer:
a. already done
b. x=3, x=4, and x=5
c. x=2, x=3, x=4, and x=6
Step-by-step explanation:
The < symbol means less than, so all values of x less than what is stated are correct
The ≤ symbol means less than or equal to, so all values of x less than, and what is stated are correct
The answer is in the screenshot.
Let me know if it helps
Some students in Grade 7 and Grade 8 take a survey about whether they would prefer to join
a movie club or a music club. The table shows the results. The students want to make a two-
way relative frequency table using row totals.
Complete each row. Round to the nearest
hundredth. You can use a calculator to help.
Movie Club Music Club Total
1.00
0.61
Grade 7
Grade 8 0.25
Total
0.39
?
1.00
Grade 7
Grade 8
Total
Movie Club Music Club
20
13
12
15
32
28
Total
33
27
60
The frequency distribution table for the question is :
Grade 7 | 0.67 | 0.33 | 1.00
Grade 8 | 0.42 | 0.58 | 1.00
Total | 1.09 | 0.91 | 2.00.
What is frequency?Frequencies refer to the number of times an event or a value occurs in a dataset. It is a count of the occurrences of a particular value or event. Frequencies are commonly used in statistics to summarize data and to help understand patterns in a dataset. The frequency of a value can be expressed as an absolute frequency (the number of times a value occurs) or a relative frequency.
The given table shows the results of a survey conducted among students in Grade 7 and Grade 8 about their preference for joining a movie club or a music club. The students want to make a two-way relative frequency table using row totals. In the table, the row totals represent the total number of students in each grade, and the column totals represent the total number of students who want to join each club.
To complete the table, we need to find the missing values. For example, in the row for Grade 7, the total number of students is 33. We know that 20 of these students want to join the movie club, so the relative frequency of Grade 7 students who want to join the movie club is 20/33, which is approximately 0.61. Similarly, we know that 13 Grade 7 students want to join the music club, so the relative frequency of Grade 7 students who want to join the music club is 13/33, which is approximately 0.39.
Likewise, we can find the missing values in the other rows and complete the table. The completed table shows the relative frequency of students in each grade who want to join each club. For example, 0.61 or approximately 61% of Grade 7 students want to join the movie club, while 0.25 or approximately 25% of Grade 8 students want to join the movie club.
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what is the value of x :?
2x = 3x - 45
[tex] \: \: \\ [/tex]
[tex] \\ [/tex]
Thanks:)
Answer:
2x-3x=-45
-x=-45
x=45
by simple method
If you roll a number cube 20 times, about how many times do you expect
to roll a number greater than 4?
Step-by-step explanation:
If you are using a fair six - sided cube , there are two numbers out of six that are greater than 4 ( 5 and 6 )
sooo: 2 out of 6 or 1/3 should be greater than 4
1/3 * 20 = 6 2/3 = ~ 7
Un comerciante obtiene 70,50€ al vender 57 latas de limón,48 de naranja y el resto cola. Si vende cada lata a 0,50€,¿cuántos refrescos de cola ha vendido?
The no of colas that have sold 36 cans.
the translation of the question is :
A merchant obtains €70.50 by selling 57 cans of lemon, 48 of orange and the rest glue. If he sells each can for €0.50, how many colas have you sold?
Total selling price is €70.50
the price of each can is €0.50
So,
the number of cans which is sold is
n = €70.50/€0.50
n = 141 cans
again
the total number of cans = no of lemon + no of orange + no of glue
141 = 57 + 48 + m
m = 36
So the colas have sold 36 cans
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The mean cost of a box of Cheerios Oat Crunch is $4.00 and the variance is .35. If the price increases by 25 cents a box, what is the new variance?
The new variance is 0.0625 / n
We can use the following formula to calculate the variance of a data set
variance = (sum of (x - mean)^2) / (number of data points)
where x is a data point and mean is the mean of the data set.
If the mean cost of a box of Cheerios Oat Crunch is $4.00 and the variance is 0.35, we can find the standard deviation as follows
standard deviation = square root of variance = sqrt(0.35) = 0.59
Now, if the price increases by 25 cents a box, the new mean cost will be
new mean = $4.00 + $0.25 = $4.25
To find the new variance, we need to calculate the sum of (x - mean)^2 for the new data set and divide by the number of data points. Let's assume we are still considering the same number of boxes.
sum of (x - mean)^2 = [(4.25 - 4)^2 × n] = 0.0625 × n
where n is the number of data points.
Therefore, the new variance can be calculated as
new variance = (sum of (x - mean)^2) / (number of data points) = 0.0625 / n
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