So first we have to subtract the area of the other shapes. So…
352-
96
48
96
48
We will end up with 64
So divide that by 2 because there is 2 rectangles.
So then you’re left with an area of 32 for each rectangle!
Then you will do 42/4 (because one of the sides is 4) so you end up with 10.5
So then, that’s your missing side:
10.5 ft