Which sentence is a translation of this equation?



x3 – 14 = 68

Answers

Answer 1

Answer:

x cube minus fourteen is equal to sixty-eight


Related Questions

A math and science museum recently installed a door that features a stained glass topper as shown. What is the are
a of the topper?

Answers

The area of the topper will be 24 square units.

What is the area of the rectangle?

A rectangle is a quadrilateral having four sides and the sum of the angles is 180 in the rectangle the opposite two sides are equal and parallel and the two sides are at 90-degree angles.

The space occupied by any two-dimensional figure in a plane is called the area. The space occupied by the rectangle in a two-dimensional plane is called the area of the rectangle.

The area of the glass topper will be:-

Area = Length x Width

Area = 6 x 4

Area = 24 square units

The image of the glass topper is attached with the answer below.

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The size of fish is very important to commercial fishing. A study conducted in 2012 found the length of Atlantic cod caught in nets in Karlskrona to have a mean of 49.9 cm and a standard deviation of 3.74 cm.

Round the probabilities to four decimal places.

It is possible with rounding for a probability to be 0.0000.


this is a homeeork problem



rv X = the length of a randomly selected Atlantic cod








g) What length do 57% of all Atlantic cod have more than?

Round your answer to two decimal places in the first box.

Put the correct units in the second box.

Answers

The z score is -0.18 and 57 % of all Atlantic cod have more than 49.23 cm in length and

What is a z-score?

The relationship between a value and the mean of a set of values is expressed numerically by a Z-score. The Z-score is computed using the standard deviations from the mean. A Z-score of zero indicates that the data point's score and the mean score are identical.

The Z-score is calculated using the formula:

z = (x - μ)/σ

where z: standard score

x: observed value

μ: mean of the sample

σ: standard deviation of the sample

Given data ,

Let the probability that a randomly selected Atlantic cod has a length of 53.68 cm or less be represented as P

Now , the equation will be

The observed value of be x

The mean of the sample μ = 49.9 cm

The standard deviation of the sample σ = 3.74 cm

Now , z-score is calculated using the formula:

z = (x - μ)/σ

And , the length of 57% of all Atlantic cod have more than is calculated by

Now , the z score with a p value of 0.43 is

z = -0.18

Substituting the values in the equation , we get

-0.18 = ( x - 49.9 ) / 3.74

Multiply by 3.74 on both sides of the equation , we get

-0.6732 = x - 49.9

Adding 49.9 on both sides of the equation , we get

x = 49.2268 cm

Hence , 57 % of all Atlantic cod have more than 49.2268 cm in length and the z score is -0.18

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Math ready Unit 5 lesson 3 task 10 part 1 BurgerRama Cartoon Dolls answer key to 4

Answers

Based on the information in the table, a graph can be created to relate the number of Supply Dolls and Demand Dolls with respect to the sale value.

How to create a graph with the information from the table?

To create a graph with the information in the table, we must identify what information should go on the x-axis and the y-axis. In this case, we are being asked to locate the sale value on the x axis and on the y axis we must locate the number of units supplied and demanded.

Based on this information, we can infer that at a lower sale price, more dolls are demanded, but not as many are supplied. On the contrary, when the price is higher ($4.00) more dolls are supplied but not as many are demanded. This means that the relationship is inversely proportional.

Note: This question is incomplete because there is some misinformation. Here is the complete information:

Task.

Joan King is marketing director for the BurgeRama restaurant chain. BurgerRama has decided to have a cartoon-character doll made to sell at a premium price at participating BurgerRama locations. The company can choose from several different versions of the doll that sell different prices. King's problem is to decide which selling price will best suit the needs of BurgerRama's customers and store managers. King has data from previous similar promotions to help her make a decision.

1. Use the data from the table above to plot points representing selling price and supply price on a graph. (Selling Price of Each Doll should appear on the x-axis, and Number of Dolls Per Week per Store should appear on the y-axis). Draw the line through the data points and write the word "Supply on this line.

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what 2n boys are divided into two equal subgroups, find the probability that the two tallest are in the same subgroup?

Answers

The probability that the two tallest are in the same subgroup is given as follows:

2/n².

How to calculate a probability?

A probability is calculated as the division of the desired number of outcomes by the total number of outcomes.

In this problem, we have that:

There are 2n boys.They are divided into two equal groups, hence each group has n students.

For each student, the probability of belonging to a group is given as follows:

1/n.

Hence the probability that the two tallest are in the same subgroup is obtained as follow:

2 x 1/n x 1/n = 2/n².

The multiplication by 2 is because there are two groups.

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Which of the following is true about graphical data? a) All graphs should start at the origin. b) An equation of the best-fit line of data can be used to estimate untested values. c) All data on a graph should be linear. d) Graphical correlations always have a positive relationship. e) The x-values of a graph can be estimated based on the y-values.

Answers

An equation of the best-fit line of data can be used to estimate untested values. Graphical data can be used to show relationships between variables, but those relationships do not have to be linear and do not always have a positive relationship.

Graphical data is a way of visually representing information in a way that can be easily understood. It is often used to determine relationships between variables, such as the relationship between prices and sales. Graphical data can be used to show correlations, even if the relationship is not linear. An equation of the best-fit line of data can be used to estimate untested values, which can be useful in predicting future values. The x-values and y-values of a graph can both be estimated based on the data presented, and do not necessarily need to start at the origin. Graphical correlations can have both positive and negative relationships, depending on the data presented. Graphical data can be a powerful tool for understanding relationships between data points.

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Heather saved $20 a week. This was 5% of her salary. What was Heather’s weekly salary?

Answers

Answer:

$400

Step-by-step explanation:

Here is my crack at it:


To find Heather's weekly salary, we can set up an equation using the information given. Let's call Heather's weekly salary "x".

According to the problem, $20 is 5% of her salary, so we can write this as an equation:

$20 = 0.05x

Now we can solve for x by dividing both sides by 0.05:

x = 400$

So Heather's weekly salary was $400.

Heather’s weekly salary would be 400$.  

If heather saved $20 a week. This was 5% of her salary. Heather’s weekly salary would be

Given, $20 = 5%

As we know, the total salary will be 100 %

If 5% = $20

then, 100% = $400 (multiplying both the sides by 20)

Thus, Heather’s weekly salary was 400$.

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Find the area of the shaded portion.

Answers

Answer:

3a^2

Step-by-step explanation:

one way of answering this question is by finding the area of the whole shape, including the non-shaded shape, then taking away the area of the non-shaded shape from the whole thing, leaving you the area of the shaded shape

Step-by-step

find the area of the whole shape

2a x 2a

= 4a^2 (or 4a to the power of 2)

Now that we have the area of the whole shape, we must find the area of the non-shaded shape and take it away from 4a^2, we do this by

a x a

= a^2 (or a to the power of 2)

now we minus the non-shaded shape away from the total area

4a^2 - a^2

= 3a^2 (or 3a to the power of 2)

The May 1, 2009, issue of a certain publication reported the following home sale amounts for a sample of homes in Alameda, CA that were sold the previous month (1,000s of $).
592 817 577 608 353 1,281 412 535 550 679
(a) Calculate and interpret the sample mean and median.
The sample mean is x = thousand dollars and the sample median is x tilde= thousand dollars.
This means that the average sale price for a home in this sample was $ and that half the sales were for less than the _____mean median price, while half were more than the _____ mean median price.
(b )Suppose the 6th observation had been 985 rather than 1,281. How would the mean and median change?
(c) Calculate a 20% trimmed mean by first trimming the two smallest and two largest observations. (Round your answer to the nearest hundred dollars.)
(d) Calculate a 15% trimmed mean. (Round your answer to the nearest hundred dollars.)

Answers

This means that the average sale price for a home in this sample was "$773" and that half the sales were for less than the median price of "$577", while half were more than the median price of "$577".

(a) To calculate the sample mean, we add up all the values and divide by the number of values:

x = (592 + 817 + 577 + 608 + 353 + 1,281 + 412 + 535 + 550 + 679)/10 = 7,727/10 = $773

The sample median is the middle value when all the values are ordered from smallest to largest:

353, 412, 535, 550, 577, 608, 592, 679, 817, 1,281

The median is 577.

This means that the average sale price for a home in this sample was $773 and that half the sales were for less than the median price of $577, while half were more than the median price of $577.

(b) If the 6th observation had been 985 rather than 1,281, the new mean would be calculated as:

x = (592 + 817 + 577 + 608 + 353 + 985 + 412 + 535 + 550 + 679)/10 = 7,610/10 = $761

The new median would still be $577.

(c) To calculate a 20% trimmed mean, we first need to find the two smallest and two largest observations, then remove them and take the average of the remaining values:

Two smallest: 353, 412

Two largest: 1,281, 817

Remaining values: 535, 550, 577, 608, 592, 679

The trimmed mean is (535 + 550 + 577 + 608 + 592 + 679)/6 = $592

(d) To calculate a 15% trimmed mean, we first need to find the three smallest and three largest observations, then remove them and take the average of the remaining values:

Three smallest: 353, 412, 535

Three largest: 817, 1,281, 679

Remaining values: 550, 577, 608, 592

The trimmed mean is (550 + 577 + 608 + 592)/4 = $576.

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Can someone answer this pls

-3y + 4 – 2 + 6y

Answers

3y+2
Or y= 1.5
Depending on how ur supposed to solve it

Answer: 3y + 2

Step-by-step explanation: First, you can organize the equation into -3y + 6y + 4 - 2. Then, you get 3y + 2. :)))))

what expressions are equivalent to 4x4x4x4x4

Answers

Answer:

4^5 = 1024

Step-by-step explanation:

in a positive number of two digits, the sum of the digits is 15, if the digits are interchanged, the number is increased by 9. Find the number.​

Answers

Answer:

the number is 78

Step-by-step explanation:

call x is the tens digit (0<x<9)

y is the unit digit (0[tex]\leq[/tex]y[tex]\leq[/tex]9)

we have:

10y+x=[tex]\oveline{yx}[/tex] (1)

10x+y= [tex]\overline{xy}[/tex] (2)

acording (1),(2) and the topic we have: (10y+x)-(10x+y)=9 ⇔9y-9x=9

⇔y-x=1 (3)

and x+y=15 (4)

from (3), (4) we have a system of equation

[tex]\left \{ {{y-x=1} \atop {x+y=15}} \right.[/tex]

⇔[tex]\left \{ {2y=16} \atop {x+y=15}} \right.[/tex]

⇔[tex]\left \{ {{y=8} \atop {x+8=15}} \right.[/tex]

⇔[tex]\left \{ {{y=8} \atop {x=7}} \right.[/tex] (conditions are satified)

the number is 78

prove that a square matrix and its transpose have the same characteristic polynomial, and therefore the same set of eigenvalues. g

Answers

The eigenvalues of a matrix are roots of its characteristic polynomial using this we prove  that a square matrix and its transpose have the same characteristic polynomial.

What is a matrix?

A collection of numbers lined up in rows and columns to form a rectangular array is called a matrix. The elements, or entries, of the matrix are the integers. In addition to numerous mathematical disciplines, matrices find extensive use in the fields of engineering, physics, economics, and statistics. In computer graphics, where they have been used to describe picture rotations and other transformations, matrices have vital applications as well.

Recall that the eigenvalues of a matrix are roots of its characteristic polynomial.

Hence if the matrices A and A Transpose have the same characteristic polynomial, then they have the same eigenvalues.

So we show that the characteristic polynomial pA(t)=det(A−tI) of A is the same as the characteristic polynomial p[tex]A^T[/tex] (t)=det(A ^T−tI)of the transpose [tex]A^T[/tex].

We have,

p[tex]A^T[/tex](t)=det([tex]A^T[/tex] −tI) =det([tex]A^T[/tex] −tI T )

=det((A−tI) [tex]A^T[/tex] )

=det(A−tI)

=pA(t)

Since I ^T =I

Since det([tex]B^T[/tex] )=det(B)for any square matrix B

Therefore, we obtain p[tex]A^T[/tex] (t)=pA(t), we conclude that the eigenvalues of A and [tex]A^T[/tex] are the same.

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Patricia decides to buy a pair of boots for $90.00. She was willing to pay $120.00. When her friend Cecilia sees the boots, she loves them and thinks they are worth $170.00. So she offers Patricia $145.00 for the boots, and Patricia accepts. Patricia and Cecilia are both thrilled with the exchange.


The total surplus received by both Patricia and Cecilia is $


Suppose that Patricia purchased the boots from Marie’s Boutique. Marie and other boutique owners in town are upset that customers like Patricia buy boots at their stores, and then resell them for a higher price. Marie and the other owners convince the city government to pass a law preventing such resale. Assuming the law is successful, how much surplus is lost if Patricia cannot sell the boots to Cecilia?

Answers

The total surplus received by both Patricia and Cecilia is $55.

What is Addition?

The process of combining two or more numbers is called the Addition. The 4 main properties of addition are commutative, associative, distributive, and additive identity.

Given that;

Patricia decides to buy a pair of boots for $90.00. She was willing to pay $120.00.

And, Her friend Cecilia sees the boots, she loves them and thinks they are worth $170.00. So she offers Patricia $145.00 for the boots, and Patricia accepts.

Hence, Consumer surplus is the difference between the willingness to pay of a consumer and the price of the good.

Consumer surplus = willingness to pay – price of the good

Consumer surplus received by Patricia = $120 - $90 = $30

Consumer surplus received by Cecilia = $170 - $145 = $25

Thus, Sum of the surpluses = $30 + $25 = $55

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The formula T=2pi sqrt(L/32) gives the time it takes in seconds, T, for a pendulum to make one full swing back and forth, where L is the length of the pendulum, in feet. To the nearest foot, what is the length of a pendulum that makes one full swing in 1.9 s?

Answers

The length of a pendulum that makes one full swing in 1.9 seconds is 3 feet.

As per the given data, the given formula is:

[tex]$T=2 \pi \sqrt{\left(\frac{L}{32}\right)}[/tex] gives the time it takes in seconds.

Where,

T is the time it takes for a pendulum to make one full swing back and forth (in seconds).

L is the length of the pendulum, in feet.

Here we need to find the length of a pendulum that makes one full swing in 1.9 seconds to the nearest foot.

Substitute the given parameters into the formula will give;

[tex]$1.9=2 \pi \sqrt{\left(\frac{L}{32}\right)}[/tex]

Now divide both sides by 2π.

[tex]$ \frac{1.9}{2 \pi}=\sqrt{\left(\frac{L}{32}\right)} \\[/tex]

[tex]$ 0.3024=\sqrt{\left(\frac{L}{32}\right)}[/tex]

Then taking square on both sides.

[tex]$ (0.3024)^2=\frac{L}{32} \\[/tex]

0.09144576 = [tex]$\frac{L}{32}[/tex]

Later multiply both sides by 32.

2.9262 = L

The approximate value of the length of a pendulum:

L ≈ 3

Therefore, the length of a pendulum is about 3 feet.

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find the equation of the slant asymptote of the function f(x)=x2+x+2/x+3​

Answers

Answer:

[tex]y=x-2[/tex]

Step-by-step explanation:

The slant, or oblique asymptote, is found by taking the quotient of the two polynomials and disregarding the remainder:

-3 |  1  1  2

____  -3_6

      1 -2 | 8

Hence, our slant asymptote is [tex]y=x-2[/tex]

covert to slope intercept form:
5x-3y=15

Answers

Answer:y=5/3 x-5

Step-by-step explanation: first find the y-intercept, when the x value is 0 that is the y intercept, then the equation becomes -3x=15, there you get

x=-5, then do the same to the other to get the x value so you get the points (0,-5), and (3,0) there you find the slope and plug in

Write an equation in slope-intercept form of the line that satisfies the given conditions.
Through (6, 3); parallel to 7x-y=3
The equation of the line is

Answers

Step-by-step explanation:

The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept. If a line is parallel to another line, it means they have the same slope. To find the slope of the line 7x - y = 3, we can rearrange it into slope-intercept form: y = 7x - 3. So, the slope of the line 7x - y = 3 is 7.

Since the line we want to find is parallel to 7x - y = 3 and has a slope of 7, the equation of the line can be written as y = 7x + b, where b is the y-intercept. To find b, we use the point (6, 3) as a solution:

y = 7x + b

3 = 7 * 6 + b

3 = 42 + b

b = -39

So, the equation of the line that passes through (6, 3) and is parallel to 7x - y = 3 is y = 7x - 39.

a group of students and adults are going to the museum and have spent a total of $115 on tickets. Adult tickets cost $5 each and student tickets cost $3 each. There are 25 more students than adults in the group. How many students are in the group and how many adults are in the group?

Answers

A group of students and adults are going to the museum and have spent a total of $115 on tickets. Adult tickets cost $5 each and student tickets cost $3 each. There are 25 more students than adults in the group therefore the number of students are in the group are 35 and the number of adults in the group are 5.

What is Cost?

This is referred to as the value of money that has been used up to produce something or deliver a service.

Since we were told that  Adult tickets cost $5 each and student tickets cost $3 then  $5 × 5 = $25 and $3 × 30 = $90. Therefore the total is $115.

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What’s the right answer

Answers

Answer:

Cosine (cos)

Step-by-step explanation:

Sine, Cosine, and Tangent have their own properties.

Cosine is adjacent over hypotenuse. We have the angle of 59, the line adjacent is 17 and the hypotenuse is x. You could also do it for the right angle.

The cost of a newspaper subscription
includes a discounted initial week. Beatriz
pays $55 for 7 weeks of the newspaper
subscription and $100 for 12 weeks.

Answers

As a result, the original discounted price is $1 while the weekly normal price is $9.

How does arithmetic work with discounts?

The fundamental formula for calculating a reduction is to increase the initial price by the provided percentage rate in decimal form. We must deduct the reduction from the initial price to determine the item's sale price.

From the given information, we have:

d + 6x = 55 (discounted price for 7 weeks)

d + 11x = 100 (discounted price for 12 weeks)

We can solve this system of equations by eliminating d. Subtracting the first equation from the second, we get:

5x = 45

Dividing both sides by 5, we get:

x = 9

Substituting x = 9 into one of the equations, we can solve for d. Using the first equation, we get:

d + 6(9) = 55

d + 54 = 55

d = 1

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Describe how you would obtain an equation in one variable to solve the system by substitution. 3x+5y=25 x-2y=-6

Answers

Solve for x in one of the equations and substitute it into the other equation.

To solve the system of equations 3x + 5y = 25 and x - 2y = -6 using substitution, we first solve for x in one of the equations. Let's solve for x in the second equation: x = 2y + 6. Next, we substitute this expression for x into the first equation: 3(2y + 6) + 5y = 25. This gives us 6y + 18 + 5y = 25, which simplifies to 11y + 18 = 25. Finally, we subtract 18 from both sides to obtain 11y = 7, and divide both sides by 11 to find y = 7/11. Now that we have y, we can substitute it back into either equation to find x.

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P(A or B)=P(A) + P(B)-P(A and B)
P(A and B)=P(A)xP(B|A)
P(B|A)=P(A and B)
P(A)
In a Pew poll of American voters, almost 80% of Democrats say the government
shutdown is a "very serious problem for the country, while just 35% of Republicans feel
the same. 54% of the people polled were Democrats and 46% were Republicans.
(a) Overall, what percentage of American voters say the government shutdown is a
"very serious" problem for the country?
%
Answer=
(b) Set up a 2x2 probability table. Round all percentages to 2 decimal places.
Democrat
Republican
Total
Serious
P(A and B)=P(A)x P(B) (if independent)
Not Serious
Total
%
%
%
%
%
%
%
%
%

Answers

Answer:For part (a), the overall percentage of American voters who say the government shutdown is a "very serious problem for the country" can be calculated as follows:

P(A) = 54% (probability of being a Democrat)

P(B|A) = 80% (probability of saying the shutdown is a "very serious problem" given that the person is a Democrat)

P(A and B) = P(A) * P(B|A) = 54% * 80% = 43.2%

P(B) = 35% (probability of saying the shutdown is a "very serious problem" for Republicans)

P(A|B) = (P(A and B) / P(B)) = (43.2% / 35%) = 123.14%

P(A or B) = P(A) + P(B) - P(A and B) = 54% + 35% - 43.2% = 45.8%

Therefore, the overall percentage of American voters who say the government shutdown is a "very serious problem for the country" is 45.8%.

For part (b), the 2x2 probability table can be set up as follows:

Serious Not serious Total

Democrat 43.2% 6.8% 50%

Republican 10.5% 35.5% 46%

Total 53.7% 42.3% 100%

Step-by-step explanation:

For each team, find the unit rate games per loss.

Answers

The unit rate for the games per loss are:

Jules’ Rules unit rate = 3 or 3/1

Pink sox unit rate = 4 or 4/1

Go - Girl unit rate = 4 or 4/1

High- 5s unit rate = 9 or 9/1

How to find the unit rate?

Unit rate = Games/Losses

Jules’ Rules unit rate = 36/12

Jules’ Rules unit rate = 3 or 3/1

Pink sox unit rate = 68/17

Pink sox unit rate = 4 or 4/1

Go- Girls unit rate = 52/13

Go - Girl unit rate = 4 or 4/1

High-5s unit rate = 72/8

High- 5s unit rate = 9 or 9/1

Therefore the Jules’ Rules unit rate 3, Pink sox unit rate 4, Go - Girl unit rate 4, High- 5s unit rate 9.

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Use the graphs to evaluate the expressions below

Answers

Answer:

5,4,2,0

Step-by-step explanation:

f(g(4))=5

g(f(3))=4

f(f(2))=2

g(g(5))=0

The value of composition function is:

1. f(g(4)) = 5

2. g(f(3)) = 4

3. f(f(2)) = 2

4. g(g(5)) = 0

To find the value of function focus on the graph of the function.

1. f(g(4))

From the graph of g(x), when x= 4 the value of y is 2.

So, g(4) = 2

Now, the value of f(g(4))

f(g(4))= f(2)

        = 5.

2. g(f(3))

From the graph of f(x), when x= 3 the value of y is 0.

So, f(3) = 0

Now, the value of g(f(3))

g(f(3))= g(0)

        = 4.

3. f(f(2))

From the graph of f(x), when x= 2 the value of y is 5.

so, f(2)= 5

Now, the value of f(f(2))

f(f(2)) = f(5)

        = 2

4. g(g(5))

From the graph of g(x), when x= 5 the value of y is 3.

so, g(5)= 3

Now, the value of g(g(5))

g(3) = 0

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Write 2^-x × 3^-x × 6^2x × 3^2x × 2^2x as a power of 6

Answers

Answer:

[tex]6 {}^{3x} [/tex]

Step-by-step explanation:

Given expression to us is ,

2^{-x} . 3^{-x} . 6^{2x} . 3^{2x} . 2^{2x}

We can rewrite it as ,

[2^{-x} . 2^{2x} ] [ 3^{-x} . 3^{2x}] . 6^{2x}

we know a^m . a^n = a^{m+n} , so ;

2^{-x +2x} . 3^{-x+2x} . 6^2x

simplify,

2^x . 3^x . 6^{2x}

we know a^m . b^m = (ab)^m , so ;

(2*3)^x . 6^{2x}

6^x . 6^2x

6^{x+2x}

6^{3x}

And we are done!

Answer:

[tex]6^{3x}[/tex]

Step-by-step explanation:

Given exponential expression:

[tex]2^{-x} \cdot 3^{-x} \cdot 6^{2x} \cdot 3^{2x} \cdot 2^{2x}[/tex]

[tex]\textsf{Apply exponent rule} \quad a^n \cdot c^n=(a \cdot c)^n:[/tex]

[tex](2\cdot 3)^{-x} \cdot 6^{2x} \cdot (3 \cdot 2)^{2x}[/tex]

Multiply the numbers:

[tex]6^{-x} \cdot 6^{2x} \cdot 6^{2x}[/tex]

[tex]\textsf{Apply exponent rule} \quad a^b \cdot a^c=a^{b+c}:[/tex]

[tex]6^{(-x+2x+2x)}[/tex]

Therefore:

[tex]6^{3x}[/tex]

Heeeelp just need to find
(f+g)(2)=

Answers

Answer:  7

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Work Shown:

[tex](f+g)(\text{x}) = f(\text{x})+g(\text{x})\\\\(f+g)(\text{x}) = (\text{x}+3)+(\text{x}^2-2)\\\\(f+g)(\text{x}) = \text{x}^2+\text{x}+1\\\\(f+g)(2) = 2^2+2+1\\\\(f+g)(2) = 4+2+1\\\\(f+g)(2) = 7\\\\[/tex]

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Another approach:

[tex]\begin{array}{lll}f(\text{x}) = \text{x}+3& & g(\text{x}) = \text{x}^2-2\\f(2) = 2+3 & \text{ and } & g(2) = 2^2-2\\f(2) = 5 & & g(2) = 2\\\end{array}\\\\\\\text{Therefore, } (f+g)(2) = f(2)+g(2) = 5+2 = 7[/tex]

prove by mathematical induction that the sum of the cubes of the first n positive integers is equal to the square of the sum of these integers

Answers

The formula for the sum of cubes of the first n natural numbers is:

(1³+2³+3³+ ... + n³) = (1 + 2 + 3 + ... + n)²

Let us consider:

A(n)=1³+2³+⋯+n³--------(1)

B(n)=(1+2+⋯+n)²---------(2)

Now plug the numbers in the above equations(1)&(2) then,we get:

A(1)=B(1)=1

A(2)=B(2)=9

A(3)=B(3)=36

A(4)=B(4)=100

A(5)=B(5)=225

So both A and B are polynomials of degree at most 4 on n, and they coincide at 5 points.

Hence A(n) = B(n) for all n.

In general, p(n) is a polynomial of degree d on n,

∑kn=1 P(k)

is defined as a polynomial of the degree of d+1 on n. This trick will help solve every single issue involving the summation of polynomials, and then find the value on d+2 points, and we will determine the sum for all n.

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Please help I will give brainliest

Answers

l=7m

Step-by-step explanation:

here us the answer of the solution

which of the following statements is true? a single variance clearing account is used to accumulate the individual variances.

Answers

The variance clearing account is used to accumulate individual variances until they can be allocated to their respective variance accounts, and the formula used to calculate the variance clearing account is the sum of all the individual variances, plus the beginning balance of the account.

A variance clearing account is a temporary ledger account used to accumulate individual variances such as direct labor cost, direct material cost, and overhead cost. The variance clearing account is used to collect all the individual variances in one account until it can be allocated to its respective variance accounts. This account has a debit side and a credit side. The debit side of the variance clearing account is used to accumulate all the unfavorable variances, while the credit side is used to accumulate all the favorable variances.

The formula used to calculate the variance clearing account is the sum of all the individual variances, plus the beginning balance of the account. This can be expressed as follows:

Variance Clearing Account = Beginning Balance + Sum of All Individual Variances

For example, if the beginning balance of the variance clearing account is $500, and the sum of all individual variances is $400, the balance in the variance clearing account would be $900 ($500 + $400). This balance can then be allocated to the respective variance accounts.

The variance clearing account is used to accumulate individual variances until they can be allocated to their respective variance accounts, and the formula used to calculate the variance clearing account is the sum of all the individual variances, plus the beginning balance of the account.

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A
28⁰
78⁰
B
C
F
ABCD is a circle with centre O. BCF is a
straight line. Angle CBD = 28° and angle FCD
= 78°. What is the size of angle BAC?
(A) 28° (B) 50⁰ (C) 74°
(D) 78°

Answers

The size of angle BAC in the given circle is 50°

What is a circle?

A circle is a round-shaped figure that has no corners or edges. In geometry, a circle can be defined as a closed, two-dimensional curved shape.

Since, no figure is given, we will draw a circle according the given information, [attached in the solution]

So, we get a circle with center O, having chords, BC, which is extended to F, DC and AB,

We have, Angle CBD = 28° and angle FCD = 78°

Therefore,

∠ DCB = 180° - ∠ DCF [Linear pair]

∠ DCB = 180° - 78°

∠ DCB = 102°

In Δ DCB,

∠ DCB + ∠ BCD + ∠ BDC = 180°

∠ BDC = 180° - (102°+28°)

∠ BDC = 50°

Since, the angles made by the same chord are equal in measure,

Therefore,

∠ BDC = ∠ BAC

Therefore,

∠ BAC = 50°

Hence, the size of angle BAC in the given circle is 50°

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