Answer: 
Step-by-step explanation:
Given
The height of the cylinder is 
The volume of the cylinder is 
The volume of the cylinder is the product of area and height

Insert the values

Thus, the area of the cross-section is 
Answer:
(x + 5)(x + 4)
Step-by-step explanation:

It goes above the 3 because 7 does not go into 6
Answer:
<em>Choice B</em>
Step-by-step explanation:
The slopes must be equal.
m = (c - a)/b
m = d/e
Answer: Choice B