exam Maths Puzzle Numerical Ability

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Divide 45a^6b^10 over 5a^3b^2.
My answer 5a^3b^5.

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exam Other Question

The cost of stainless steel tubing varies jointly as the length and the diameter of the tubing. If a 5 foot length with diameter 2 inches cost $48.00, how much will a 13 foot length with diameter 6 inches cost?

help set up what is the answer to the question I need the formula for the funtion of those please.