round to the nearest hundredth

Question

A model rocket is launched with an initial upward velocity of 125ft/s
. The rocket's height h
(in feet) after t
seconds is given by the following.

h=125t-16t^2

Find all values of
for which the rocket's height is 71
feet.

Round your answer(s) to the nearest hundredth.

Answer 1

h=125t-16t²

 

the rocket's height is 71

 

71 = 125t -16t²

 

-16t²  +125t -71 =0

 

solve this quadratic equation using quadratic frmula

 

t=0.62 t=7.20