SOLUTION: Fireworks are launched over a lake off a dam 28ft above water. The height of the display, t seconds after it has been launched, is given by h(t)=-16t^2+48t+28. After how long will

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Fireworks are launched over a lake off a dam 28ft above water. The height of the display, t seconds after it has been launched, is given by h(t)=-16t^2+48t+28. After how long will      Log On


   



Question 861336: Fireworks are launched over a lake off a dam 28ft above water. The height of the display, t seconds after it has been launched, is given by h(t)=-16t^2+48t+28.
After how long will the shell from the fireworks reach the water?

Answer by fcabanski(1391) About Me  (Show Source):