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Joe throws a ball upwards from a height of 12 feet from ground level. The height of the ball above the ground after time t second from when the ball was thrown is given by the expression h(t)= `-t^(2)+at+b` . The ball comes back to the ground after 8 second. What is the value of (a+b)?

A

6.5

B

12

C

18.5

D

19

Text Solution

Verified by Experts

The correct Answer is:
C
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