SOLUTION: The cost C of steel tubing is jointly proportional to its length L​, in​ feet, and diameter D​, in inches. If a 2 foot tube with a 3 inch diameter costs &#8203

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Question 1113664: The cost C of steel tubing is jointly proportional to its length L​, in​ feet, and diameter D​, in inches. If a 2 foot tube with a 3 inch diameter costs ​$12​, find the cost of a 6 foot tube with a diameter of 6 inches.
What is the cost of a 6 foot tube with a diameter of 6 ​inches?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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The cost C of steel tubing is jointly proportional to its length L​, in​ feet, and diameter D​, in inches.
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C=k%2ALD

k=C%2F%28LD%29

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If a 2 foot tube with a 3 inch diameter costs ​$12​,...
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k=12%2F%282%2A3%29

k=2

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highlight_green%28C=2%2ALD%29