A film set designer is using white and colored tiles in a pattern to create paths of different lengths. If x is the length of the path in feet, the number of colored tiles needed to make it is calculated using the rule (3xy)(7xy2), where y represents the number of white tiles.

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valpey · Answer

Cool.

valpey · Answer

And I assume you mean (where c(x,y) is the number of colored tiles given the length in feet (x) and the number of white tiles (y):
$$c(x,y) = (3xy)*(7xy^2)$$