answers are in the pictures

We need to solve for x, we need to get x alone

Lets start by removing -5
Add 5 on both sides


Now to isolate x , we need to remove the square from x
To remove square , take square root on both sides

square and square root will get cancelled

So
and 
If the width is 12 and the length is 18, the perimeter of the rectangle is 12 + 12 + 18 + 18, or 60. So yes the perimeter can be 60.
C, not sure but C. It makes sense to me & I got it right when I did it
Answer:3+24b
Step-by-step explanation:
3(1+8b)
3+24b