Posted by chase on Tuesday, January 29, 2013 at 5:53pm.
The formula h=280t7t^2 gives the height, h in meters, of a rocket t seconds after take off. The maximum height reached by the rocket is 2800 m. How long will it take the rocket to reach this maximum height?

Algebra  Henry, Thursday, January 31, 2013 at 10:30pm
h = 280t  7t^2 = 2800.
7t^2 + 280t  2800 = 0
Use Quadratic Formula.
t = 20 s.