A boat in still water is 32 mph. If the boat travels 72 miles upstream in the same time that it takes to travel 120 miles downst
1 answer:
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Answer:
a)
b) 0.09
Step-by-step explanation:
We are given the following in the question:
where B(t) gives the brightness of the star at time t, where t is measured in days.
a) rate of change of the brightness after t days.
b) rate of increase after one day.
We put t = 1
The rate of increase after 1 day is 0.09