SOLUTION: The price of a steel rod varies jointly as the length and the square of the diameter. If an 18-foot rod with 12-inch diameter cost 12.60 dollars, then what is the cost of a 12-foot

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Question 1012711: The price of a steel rod varies jointly as the length and the square of the diameter. If an 18-foot rod with 12-inch diameter cost 12.60 dollars, then what is the cost of a 12-foot rod with 3-inch diameter.
Answer by algebra hello(55) About Me  (Show Source):
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The price of steel rod of 18 foot rod and 12 inch diameter=(144-18)/10
=12.60
then price of 12 foot rod and 3 inch diameter is=(9-12)
=3 dollars