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Posted by on Tuesday, January 29, 2013 at 5:53pm.

The formula h=280t-7t^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 - , Thursday, January 31, 2013 at 10:30pm

    h = 280t - 7t^2 = 2800.
    -7t^2 + 280t - 2800 = 0
    Use Quadratic Formula.
    t = 20 s.

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