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The changing rate of the amount of water in the watering can is a constant rate of 0.15 gallon per minute.
The initial volume of water in the can at time = 0 is 5 gallons
The function will be a linear function in the form of

where

is the volume of water in the can after

minutes

is the changing rate

is the initial volume when time is 0
Substitute all the values into the form we have
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