Evaluate 3x2 – 3y3 when = 4 and y = 3

Can someone pls ! pls answer all. no explanation needed..

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x