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For an object shot into the air, its height in feet above the ground after seconds is given by the equation . Use this equation to answer the following questions.

  1. At what times is the object on the ground?

    This is when the height is zero, or .

  2. For what domain is this function reasonable?

    This is an object shot into the air, hence its height is always positive or . For what times is ?

  3. How long did it take the object to hit the ground?

    Use your answers to part (a).

  4. For what times is the height greater than feet?

    Solve .