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Balloon Volume Rate of Change

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The volume of air in a balloon at time tt, in minutes, is modeled by
V(t)=50+20t2t2for 0t8. V(t) = 50 + 20t - 2t^2 \quad \text{for } 0 \leq t \leq 8.
At what rate, in cubic units per minute, is the volume of air in the balloon changing at time t=3t = 3 minutes?

A

−4

B

20

C

14

D

8

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