Intermediate algebra, concepts and graphs

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a bullet is fired into the air with an initial upward velocity of 64 fps from the top of a building 80 feet high. The equation that gives the height of the bullet at any time (t), is h=80+64t-16t^2. Find the times at which the arrow will be 128 feet in the air? This talks about a bullet but asks about an arrow, how do I answer this for the arrow?

  • Intermediate algebra, concepts and graphs -

    My post was rejected.

  • Intermediate algebra, concepts and graphs -

    t^2-4t-5=-8

  • Intermediate algebra, concepts and graphs -

    t^2-4t-5=-8

    (t-1)(t-3)=0

  • Intermediate algebra, concepts and graphs -

    Step 1: h = -16t^2+64t+80=128.

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