Given:
square shape
Perimeter 28 feet
Find its area
A square has 4 equal sides, so perimeter is 4a
Perimeter = 4a
28 ft = 4 a
28 ft / 4 = a
7 = a
One side of the the square is 7 ft.
Area of a square is the measure of one side raised to the power of 2.
A = a²
A = (7 ft)²
A = 49 ft²
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It can go into 136 4 times. Just do 136 divided by 34. It's even enough to go into it.
The answer to this question is -10
Set



so that the volume element is

The integral is then


and so evaluates to 0.