Question

Please help me please please.

Answer 1

`4w+18`

Explanation:

The formula for the perimeter of a rectangle is:

`P=2(l+w)`

We know that the length l is w+9. Substitute:

`P=2((w+9)+w)`

Combine like terms:

`P=2(2w+9)`

Simplify:

`=4w+18`

And that's our expression :)

And we're done!