Answer:

Step-by-step explanation:
Let's start by finding the radius of this circle.

Note that in the equation:

"A" stands for area and "r" stands for radius.
Now, let's substitute the given values into the equation.

Answer:
4/15
Step-by-step explanation:
1) find common denominator, 15 in this problem
2) solve

Answer:
1/12 my guy
Step-by-step explanation:
There really isn't one
Answer: C. Engine life decreases steady with time.
Step-by-step explanation: