Answer:
After 2.5 seconds.
Step-by-step explanation:
The function represents the height of the ball. So when it hits the ground, the height of the ball is 0. You set h = 0 and solve for t. Once you do that, you get t = -4, 2.5. However, time can't be negative so only 2.5 seconds is an answer
It's the one in the top right corner. Since the inequality says 'greater than or equal to' the line has to be bold and the shaded area has to be above the line. Hope this helped!