PLEASE HELP ME I ONLY HAVE 20 MINUTES!!!! The height of a tennis ball tossed into the air is modeled by h(x) = 40x -16x^2, where x is elapsed time in seconds. During what time i…

Question

asked Dec 27, 2021 205k views

1 Answer

JacobWuzHere · Answer 1 · 2021-12-31T19:59:31+0000

$h(x) = 40x - 16x^2\\h(x) = 15\\40x - 16x^2 = 15\\-16x^2 + 40x - 15 = 0\\$

Using the quadratic formula we get

$x_1 = 0.5\\x_2 = 2.04$

Therefore the tennis ball is at least 15 feet above the ground from 0.5 seconds to 2.04 seconds