Question 1128422
At a resort, tourists watch swimmers dive from a cliff to the water 144 feet below.
 A diver's height h above the water t seconds after diving is given by 
h = −16t2 + 144.
 How long does a dive last?
height of the water is 0 
{{{-16t^2 + 144 = 0}}}
{{{-16t^2 = -144 }}}
{{{t^2 = (-144)/(-16)}}}
{{{t^2 = +9}}}
t = {{{sqrt(9)}}}
t = 3 seconds