Mathematics, 12.02.2021 05:10 turtlesage21

Your younger sibling runs up to you and excitedly exclaims, “I’m thinking of a number. If I add it to the number 2 ten times, that is, 2 + my number + my number + my number, and so on, then the answer is 2. What is my number?” You almost immediately answer, “zero,” but are you sure? Can you find a different number (other than zero) that has the same property? If not, can you justify that your answer is the only correct answer?

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Your younger sibling runs up to you and excitedly exclaims, “I’m thinking of a number. If I add it t...