College Algebra
posted by Anonymous please help! :) .
The distance, d, in feet that an object falls in t seconds is modeled by the formula d=16t(2) if you dive from a height of 128 feet, how long will it take to hit the water? (answer may be in simplified radical form).

just solve
16t^2 = 128
t^2 = 8
t = √8 = 2√2