1. The path of a tennis ball is given by the function f(t)=t2+8t.(f)trepresents the height in feet andtrepresents the time in seconds. At what time, in seconds, will the ball reach its maximum height?

A. 4 seconds B. 16 seconds C. Cannot be determined D. 8 seconds

2. Sadan throws a football that follows a parabolic path. The vertex represents the time when the ball reaches its maximum height. True or False

3. The sum of 2 numbers is 40 and their product is a maximum. Find the two numbers. Show and explain your work.

4. Identify the vertex and state whether it is a maximum or minimum. Be sure to show all work. f(x)=5x2+10x25