Avolleyball reaches its maximum height of 13 feet, 3 seconds after its served. which of the following quadratics could model the height of the vollyball over time after it is served. select all that apply. a: f(x)=2x^2+12x+5 b: f(x)=-2x^2+12x-5 c: f(x)=-2x^2-12x+5 d: f(x)=-2(x-3)^2+13 e: f(x)=-2(x+3)^2+13

Only selections B and D give a maximum height of 13 at t=3. However, both of those functions have the height be -5 at t=0, meaning the ball was served from 5 ft below ground. This does not seem like an appropriate model.

We suspect ...
• the "correct" answers are probably B and D
• whoever wrote the problem wasn't paying attention.