Question

Distributive property
Write 3x(21+15) using distributive property

Answer 1

3x ( 21 + 15 ) = 108(I know this is not the question but I wanted to solve it.)

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Answer 2

63x+45x = 108x

You just multiply 3x by 21 and 15 to get 63x and 45x. You then add the like terms to get 108x.