How do you write a general rule for finding a power of a power?

An empty bucket is placed under a faucet dripping at a constant rate of 4 milliliters per minute. with the given information, which of these statements is a reasonable conclusion? a there will be 24 milliliters of water in the bucket after 16 hour. b there will be 60 milliliters of water in the bucket after 14 hour. c there will be 160 milliliters of water in the bucket after 20 minutes. d there will be 100 milliliters of water in the bucket after 40 minutes.

I’m stuck on this equation, anyone got the answer?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.