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Question:

Which of the following expressions is equivalent to 3x(2+5y)?

A 6x+15xy
explanation

Begin by noticing the form in which the answer choices are written. As no answer choice contains a parenthetical expression, start by distributing the 3x through the parentheses. Multiply 3x by each of the terms inside of the parentheses and combine any like terms:
3x(2+5y)
=3x(2)+3x(5y)
=6x+15xy

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