Same height when both equations are equal
-16x^2 + 74x + 9 = -16x^2 + 82x
82x - 74x = 9
8x = 9
x = 9/8
x = 1.125
x = 1.13 ---->rounded to nearest hundredths of seconds
answer
1.13 seconds
Value #0 = 25,000 (1 + .12)⁰ = $25,000
Value #1 = 25,000 (1 + .12)¹
Value #2 = 25,000 (1 + .12)²
Value #3 = 25,000 (1 + .12)³
.
.
.
Value #16 = 25,000 (1 + .12)¹⁶ = 25,000 (6.1304) = $153,259.84
I think it was Albert Einstein who was purported to have said that
"Mankind's greatest invention of all time has been compound interest.".
(-3.5, 8)
You figure this out with the midpoint formula