Help!! What is equivalent to the expression -2x(-4 + x)

A. 8x - 4x
B. -8x + 4x²
C. -8x + 2x²
D. 8x + 2x²
E. 8x - 2x²

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?

Write the equation in logarithmic form e^x=403.429

Ineed with math stuff it involves graphs