Idon't remember sector area, and this is on my review for my geometry final

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?

Given that abcd is a rhombus, what is the value of x?

Use the distance formula to find the distance between (-3,5) and (3,1)