What is the value of x?

(x+15)
(4x-20)
(x)

a-x=32
d-x=40
i eliminated b and c
need

What is the solution of the systems of equations? y=2/3x+3 x=-2

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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?