Question 987862
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ s(t)\ =\ -16t^2\ +\ 89t]


Set the function equal to 100 and solve for *[tex \Large t].  Since this is a quadratic equation, it will have two roots.  If both roots are positive, then each is a time when the projectile is at an altitude of 100 feet; once on the way up, and once on the way down.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \