Answer:
fff
Step-by-step explanation:
By pythagorean theorum we calculate the height:

=
= height of triangle
area of triangle = base * height
area = 
There are two triangles so:

Multiply this by 13.25 to get total cost:
=$259.65
The answer is approx. 10.8 per hour.
If you want to round it up, it would be 11. I prefer you not to round though as this is Money. Money should have decimals included.
F(X) = x^4 +64x^2
x^4 +64x^2 = x^2(x^2 +64)
hope this will help you
The answers are D, A, and C