Question

PLEASE HELP. multiply or divide. show your work.
1. 5x+10/x+2*2x/4x-10
2. 3n^2-n/n^2-1 ÷ n^2/n+1
3. the width W of a rectangular swimming pool is 7x^2. the area A of the pool is 7x^3-42x^2. what is an expression for the length of the pool?

Answer 1

5x+10/x+2*2x/4x-10
6x+10
8x+10
12x+10/2/-10
12x+5/-10
12x+-2
-12 -12
x = 24
I think

Answer 2

whatta bout the other ones?

Answer 3

1.\[\frac{5x+10}{x+2} \cdot \frac{2x}{4x-10}\]\[\frac{5\color{red}{(x+2)}}{\color{red}{x+2}}\cdot \frac{2x}{4x-10}\]\[=\frac{5\cdot 2x}{4x-10}\] Simplify.

Answer 4

would that be the asnwer?
im confused..

Answer 5

2.\[\frac{3n^2-n}{n^2-1} \div \frac{n^2}{n+1} \implies \frac{3n^2-n}{n^2-1} \cdot \frac{n+1}{n^2} \]Factor out like terms from each fraction. \[\frac{3\color{red}{n^2}-\color{red}{n}}{\color{blue}{n^2-1}} \cdot \frac{\color{blue}{n+1}}{\color{red}{n^2}}\]\[\color{blue}{a^2-b^2 = (a-b)(a+b)}\]Simplify.

Answer 6

I'm not giving you answers, I'm just helping you work them out.

Answer 7

You have to simplify them yourself and find the answer.

Answer 8

idk how to do that

Answer 9

honestly, i've never been good at math. i cant comprehend it good

Answer 10

doesn't she need to divide the or subtract the fore from 4x and 10

Answer 11

\[4x-10 \rightarrow 4\left(x-\frac{10}{4}\right)\]

Answer 12

is that the answer?

Answer 13

3) question
area =wl=7x^2(l) =7x^3-42x^2 given

l ength =7x^3-42x^2
---------------
7x^2
that's a division
simply divide by 7 and x^2 gives the answer