Answer:
The rock splashes down when h(t) = 0. Set h(t) = 0 and solve for t using quadratic formula.
0 = − 4.9t^2 + 178t + 325
t = 38.07, -1.74
(Throw away the negative answer, since time can't be negative.)
t = 38.07 sec
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Substitute 21 for x.
y = 21 - 4 = 17
3/47 is a rational number
p/q is a rational number, where p and q are real integers, and q does not equal to 0.
