Question

Please take a look and help if you can!

Answer 1

see explanation

Explanation:

1

The area of a rectangle = length × width

2

To find the width, divide the area by the length

3

width =
`(area)/(length)` =
`(3x^2+9x)/(3x)`

To simplify divide each term on the numerator by 3x

=
`(3x^2)/(3x)` +
`(9x)/(3x)` = x + 3 ← width