For this case we must factor the following polynomial:

We can take common factor x:

To factor the expression within the parenthesis, we must find two numbers that when multiplied give 49 and when added together, 14 are obtained. These are: 7 and 7.

Thus, the expression is factored as:

Answer:

A=pi radius^2
7 is the radius
Pi7^2=153.93
I have no clue what that is
The most simple way is to get 8 questions right on a ten question test. 8q/10q = 80%.
I don’t really know but try a calculator