So hmmm check the graph below
now.. to find the vertex of any quadratic

so... how long did it take? well, it took

what was the highest point? well, it was

when did he hit the water? well, at y = 0
that is

solve for "t"
Answer:
93.5
Step-by-step explanation:
0 and 3 are in the tenths place value
9 and 6 both increase when rounding
55.1 + 38.4 = 93.5
Percent decrease : (original number - new number) / original number)...x 100
(13.00 - 7.50) / 13.00 = 5.5/13 = 0.42....x 100 = 42% decrease
Let x be the number. x= 2x-17
-x=-17
x=17