math
posted by Sara! on .
how do i write these in equations to represent each situation?
1. the perimeter P of a rectangle is the sum of twice the length L and twice the width W
2. the volume V of a rectangular prism is the product of its three dimensions: length L,width W, and height H
3. The cost C of a telegram of 18 words is the cost F of the first 10 words plus the cost A of each additional word.

how do i write these in equations to represent each situation?
1. the perimeter P of a rectangle is the sum of twice the length L and twice the width W
2. the volume V of a rectangular prism is the product of its three dimensions: length L,width W, and height H
3. The cost C of a telegram of 18 words is the cost F of the first 10 words plus the cost A of each additional word. 
P=2(L+W)
Try the rest, and post the answer for a check if you wish.