Question

your friend competes in a high jump competition at a track meet. the function h=-16t+18t models height h(in feet ) of your friend after t seconds. after how many seconds is your friend at a height of 4 feet? after how many seconds does your friend land on the ground?

Answer 1

The function that models the height is given by:
h=-16t+18t

thus the value of t when h=4ft will be:
4=-16t+18t
4=2t
h=4/2
t=2 seconds

Answer: 2 seconds