Answer:
x times 2y times pi
Step-by-step explanation:
The formula is height times diameter times pi. diameter is two times the radius, and 2 times y is 2y. the rest is simple. multiply them together an you get the answer
If there are 646,449 people in 68.3 square miles. each square mile area has 9465 people.
By definition, the circumference of a circle is:

The area of a circle is:

Where,
r: radius of the circle.
When the radius is double, then the new area is:

Rewriting we have:

In terms of a we have:
Answer:
The new area of the circle in terms of a is:
First you gotta do rise over run. then once you do that, you should get your answer. which is x=-4