APFIVE Balloon Volume Rate of Change
The volume of air in a balloon is modeled by the function $$V(t) = 50 + 20t - 2t^2$$ for $$0 \leq t \leq 8$$, where $$V(t)$$ is measured in cubic units and $$t$$ is measured in minutes. At what rate is the volume of the balloon changing at time $$t=3$$?
A
20
B
−4
C
14
D
8
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