How would you write "The sum of a number and 7" as an algebraic expression?

Expert Answers

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Your question is very vague so I do hope this answer is sufficient.

When you have an unknown quantity, you can call it x,y or any letter actually although x is the most common.

  • Let the unknown number `=x`

Next consider what you are required to do. We are looking for "the sum of" ...which mean we must ADD our unknown to 7

  • `x+7`

So this is now complete.  The answer to your question is: x+7

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