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# Change in Altitude

APCALC-KXTTT0

The rate of change of the altitude of a drone is given by $r(t)=t^{3}-6t^{2}+20,0\leq t\leq 6$.

Which of the following expressions gives the change in altitude of the drone during the time the drone is descending?

A

$\int_{0}^{4}r(t)dt$

B

$\int_{2.337}^{5.284}r(t)dt$

C

$\int_{2.337}^{5.284}r'(t)dt$

D

$\int_{0}^{6}r(t)dt$