Question 632872
At time t = 0 a slingshot fires an egg straight up from a window of a tall building. The height of the egg above ground as a function of time is given by 
y = -4.9t2 + 21t + 56, where y is in meters and t is in seconds.
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a. How high up is the window?::: 56 meters
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b. How high is the egg after 3 s? find f(3)
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c  After launching the egg, how long does the shooter have to wait to see the egg go by the window on the way down?:: Solve f(t) = 56
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d. At what times is the egg 65 m above ground? (Solve with the quadratic formula; then check your work using the trace feature of a graphing calculator.)
Or solve for f(t) = 65
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e. When does the egg impact the ground?:: Solve f(t) = 0
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Cheers,
Stan H.
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