Solve 5x+x-3x>-12 What is the solution

Find the value of the variable and the length of each secant segment.

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?

Need showing work for this problem 56.25 ×25.80