One person at the top of a waterfall that is 90 feet tall dumps into the water. The distance from the person to the water can be modeled by the equation h = -16t2 + s, where h is the height from the water, t is the
time in seconds, and s is the initial height from the water in feet. How long will it take for the person to
reach the water? Round your answer to the nearest tenth of a second.

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −