Question 1038550
The function h(t)=-16tē+21,980 describes the relationship between height in feet and the time in seconds. How many seconds did he fall before reaching the ground? 
:
Ground level, h=0, therefore
-16t^2 + 21980 = 0
-16t^2 = -21980
same as
16t^2 = 21980
t^2 = 21980/16
t^2 = 1373.75
t = {{{sqrt(1373.75)}}}
t = 37 secs falling to the ground