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Mathematics
Problem
Let
F
(
t
)
F(t)
F
(
t
)
(cars per minute) denote the traffic flow into a parking garage at time
t
t
t
minutes after opening. Interpret the statement
∫
30
45
F
(
t
)
d
t
=
−
60
\displaystyle \int_{30}^{45} F(t)\,dt = -60
∫
30
45
F
(
t
)
d
t
=
−
60
in the context of the situation, explicitly addressing the sign and units of the result.
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