Suppose you spent $38.25 for 3 shirts that each cost the same amount. if the cost of the shirts varies directly with the number of shirts you buy, what is the constant of variation?

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This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.