The quadratic function h (t) = - 16t^2+150 models a balls height, in feet, over time, in seconds, after it is dropped from a 15 story building

From the equation, h (t) = - 16t^2+150. You are given the height of the building which is 15ft and you are asked to find the time it takes to fall in seconds.

h (t) = - 16t^2+150

15=-16t^2+150

15 - 150 = - 16t^2

-135 = - 16t^2

t = 2.9 seconds