A cup of coffee at
80\deg C
is put into a cooler room when
t=0
. The coffee's temperature is changing at a rate of
r(t)=-6.7(0.9)^(\deg C)
per minute, with
t
in minutes. Estimate the coffee's temperature when
t=19
. The temperature when
t=19
is
◻
\deg C
.
◻
◻