A basement is flooded with 640 cubic feet of water. It takes 4 hours to pump out

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A basement is flooded with 640 cubic feet of water. It takes 4 hours to pump out the water at a constant rate. Let f(t) be the number of cubic feet of water that remains in the basement after t hours of pumping.
a. Find a linear equation off.
b. Graph f by hand.
c. What are the domain and range of the model? Explain.
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