Algebra-2

Question Analysis
This question applies the concept of solving polynomial equations by graphing to a real-world context. The student must identify the x-intercepts of the quadratic function, which represent the times when the projectile hits the ground.

Key Concept Explanation
The solutions to a polynomial equation are the x-intercepts of the corresponding polynomial function. In this case, the x-intercepts represent the times when the height of the projectile is zero.

Step-by-step Solution
1. Graph the function