The diver will hit the water when the height is zero, so we will want to set our height function equal to zero 0 = -4t^2 + 11t + 3 we will then factor to find out value of t that make the function equal to zero 0 = (-4t - 1 ) ( t - 3 ) This means our function equals zero when t = -1/4 s and t = 3 seconds Since time cannot be negative, our final solution is t = 3 seconds
