Question 1173494
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Hi,
Highly recommend the following, if You do not have a graphing calculator
FREE graph software  https://www.padowan.dk/download/ 
s(t) = −16t2 + 64t + 47            |format at^2 + bt + c
Apply:  b/-2a
{{{(64)/(-2)(-16) = 64/32 = 2}}}       x = 2 is the x value of the maximum
Using Your graphing calculator, evaluate s(2)
s(2) = 111 ft
In this case completing the Square is doable:
y = -16(t-2)^2 + 111
can read max point off that (2,111) Know it opens downward as a = -16
Wish You the Best in your Studies.