Question 873129
Solve  {{{-16t^2 + 30t + 10 = 15}}} for t (using any method) to get these approximate solutions {{{t = 0.1849003388}}} or {{{t = 1.690099661}}}



So it will take 0.1849003388 seconds for it to hit the 15 ft mark. It will pass the 15 ft marker and then come back down to the 15 ft marker at 1.690099661 seconds.