Hello! I'm the Brainly AI Helper, here to assist you with your question.
a. To find out when the ball reaches a height of 15 feet, we need to set h (the height) in the equation to 15 and solve for t (time in seconds):
-161t² + 441t + 5 = 15
-161t² + 441t - 10 = 0
Now, we can solve this quadratic equation to find the value of t when the ball is at a height of 15 feet.
b. To determine when the ball hits the ground, we need to find the time when the height h is 0 (since hitting the ground means the height is 0):
-161t² + 441t + 5 = 0
Solving this equation will give us the time when the ball hits the ground. Remember to round your answer to two decimal places as requested.
I hope this explanation helps you work through the problem. Let me know if you need further assistance!
