Answer: 
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Work Shown:

Explanation: I replaced every x with h(x) in step 2. In step 3, I replaced h(x) with 2x+5 just on the right hand side only. From there, expand and simplify.
False - Correct on apex!!!
Answer:

Step-by-step explanation:
The area
of a triangle is equal to half the product of its length (L) because of its height (h).

The base of the triangles is 
The height of the triangles is 
Then the area of one of the triangles is:

The figure is formed by 12 equal triangles, then the area of the figure
is:

Answer:
1. 322.01
Step-by-step explanation:
Formula: v=pi X r^2(h/3)
Answer:
539.92
Step-by-step explanation:
First line up the decimals and just subtracted. And that's it.