Question 616574
Amir pitched a baseball at an initial height of 5.9 feet with a velocity of 73.16 feet per second.  About 
how long will it take the ball Amir pitched to hit the ground?
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The equation commonly used is
{{{h(t) = -16t^2 + vt + h}}} where v = vertical speed and h = initial height
{{{h(t) = -16t^2 + 73.16t + 5.9}}}
At impact, h(t) = 0
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{{{h(t) = -16t^2 + 73.16t + 5.9 = 0}}}
*[invoke solve_quadratic_equation -16,73.16,5.9]
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Ignore the negative solution
t =~ 4.652 seconds