Solve for x. ax+bx=21

Answers

Answer 1

Answer: ax + bx = 21

factor out x

x(a + b) = 21
x = 21/(a+b)

Answer 2

Answer: ax+bx =21
on factorising x, we get
x( a+b) =21
x = 21/a+b

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PLEASE PLEASE PLEASE HURRY!Which is the best strategy to use to solve this problem?

Mr. Jackson wants to build a pool in his backyard. He plans to put a safety fence around the rectangular pool area that has an area of 400 square feet. He wants to use as little fence material as possible.

What are the dimensions Mr. Jackson should use for his rectangular pool area?

A.
Make a list.

Create a list of all possible whole-number combinations of length and width that would equal an area of 400 square feet. Then start calculating the perimeter of each rectangle. Look for a pattern to decrease the number of calculations you have to make.

B.
Write a number sentence.

Use a number sentence to calculate the area of a rectangle. Use guess and check to find two numbers that when multiplied will give a product of 400.

C.
Use objects.

Arrange 400 square tiles in different patterns until you get a rectangular shape. Count the number of tiles on the perimeter of the shape.

Answers

I believe it might be A or C. Not really sure

Hugh is going to bye school supplies pencils are $0.25 each,notebooks that are $2.50 each,back packs are $32.00 each.hugh bought x notbooks.write an expression for the cost of the notebooks? julio bought a backpack and y pencils. he spent less than $50. write an inequality that shows how much Julio spent.

Answers

32 + 0.25y + 2.50x < 50

That's just my guess. I'm not 100% sure.

Prove that (x^5)-(x^2)+2x +3=0 has at least one real root.Prove that x=cosx has at least one solution.

Answers

The first one is of order 5, so it has either 1, 3 or 5 real roots (unless any coefficent was complex). Proof complete :)
The other one, if it has a solution, it must be in [-1;1]. Because it only gives positive results the solution is further restricted to [0;1]. Because the cosine function is continuous and strictly decreasing on this interval, the difference of x and it's cosine will shrink up to some point within the interval where it gets to 0 (the solution) and then flips sign (the cosine gets less than the number), further decreasing until the end of the interval.

Answer:

ok no cap

Step-by-step explanation:

You read 9.759.75 pages in your science book and 24.524.5 pages of a play for English class. It takes you 1.21.2 minutes to read each page of science and 0.80.8 of a minute to read each page of the play. How much time do you spend reading?

Answers

Answer: You spent 31.39 minutes reading.

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given ( you write the numbers doubled, 9.759.75 is 9.75)

If you read 9.759.75 pages in your science book and it takes you 1.2 minutes to read each page, we simply have to multiply the numbers of pages by the time spent for each page.

9.75 pages x 1.21 minutes = 11.79 minutes

We do the same thing for the play:

24.5 pages x 0.8minutes = 19.6 minutes

Finally, we sum both results:

11.79 m + 19.6 m =31.39

You spent 31.39 minutes reading.

A storeowner applies a 15% markup to a lamp costing $159. What is the retail price of the lamp