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OpenStudy (anonymous):
If a ball is thrown upwards from a platform 4 feet high with an initial velocity of 80 ft/sec, its height h (in feet) above the ground t seconds after it is thrown is given by the formula h = −16t2 + 80t + 4. At what times is the ball at least 100 feet above the ground? Express your answer in interval notation.
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OpenStudy (zarkon):
[2,3]
OpenStudy (zarkon):
solve h(t)=100
OpenStudy (anonymous):
could you show steps because I got a different answer which i know is wrong
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