How do you write the phrase as an algebraic expression: twice the sum of 15 and a number?

Question: How do you write the phrase as an algebraic expression: twice the sum of 15 and a number?

Answer: First, let’s call “a number” n.

Then “the sum of 15 and a number” can be written as: 15+n

Now, we can write “twice the sum” as”

2(15+n)

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