Concrete forming tubes are used as molds for cylindrical concrete supports. The volume V of a tube is the product of its length l and the area A of its circular base. You can make 2/3 ft^3 of cement per bag. Write a rule to find the number of bags of cement needed to fill a tube with a 4-in. radius. A 5-inch radius? A 6-inch radius?
What is a rule for the volume V of any tube?
What operation do you use to find the number of bags needed for a given volume?
Please explain.
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