The formula for the area of a circle is

We know the diameter, and the radius is half of the diameter. So the radius is 9. Now we plug that into the formula.

So the answer is B, 81 pi square feet
You set both expressions equal to each other, then solve for x. Your answer will be x=12
4n-3=4n-2 subtract 4n from both sides
-3=-2
Since -3!=-2, there is no solution.
So your answer is a.
Answer:
a. 54.75
b. 2.64
Step-by-step explanation: