Question

I need help on number 8 please help!!!

Answer 1

Answer:

• A) 9 ft
• B) 13 ft
• C) 1/2 second

Step-by-step explanation:

Your notes on the problem tell you how to work it.

Part A. The height of the ball when t=0 is d(0) = 9 . . . . feet.

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Part C. (Your notes rightly say work this first.)

... t = -b/(2a) = -16/(2(-16)) = 1/2

The ball reaches its maximum height after 1/2 second.

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Part B. d(1/2) = 16t(-t+1) +9 = (16)(1/2)(-1/2 +1) +9 = 4 +9 = 13 . . . . feet.

The maximum height is 13 ft.