How do I find the indicated value for this problem?

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.

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).