Jake needed to find the perimeter of an equilateral triangle whose sides measure x + 4 cm each. Jake realized that he could multiply 3 (x + 4) = 3x + 12 to find the total perimeter in terms of x. Which property did he use to multiply?

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Jake needed to find the perimeter of an equilateral triangle whose sides measure x + 4 cm each. Jake realized that he could multiply 3 (x + 4) = 3x + 12 to find the total perimeter in terms of x. Which property did he use to multiply?