Which graph uses percentages to describe data?

bar
circle
line

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

How do i simply this radical expression?