In an archer shoos an arrow straight upward with initial

Last updated: 7/8/2022

In an archer shoos an arrow straight upward with initial velocity of 80 ft/sec from a height of 4 feet then it's height above the ground in feet at time t in seconds is given the function: h(t) = -8t² + 80t + 4 a. What is the maximum height reached by the arrow? b. How long does it take for the arrow to reach the ground?