How do i solve this?

If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? use the equation h = −16t2 + 64t + 4.

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =