The additive inverse of -3/7 is

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A 7/-3
B -7/3
C 3/7
D 5/7

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Answer: C. 3/7

The additive inverse of a number is what you add to it to get 0. Since -3/7 + 3/7 = 0, the additive inverse of -3/7 is 3/7. Option b, -7/3, is the reciprocal of -3/7 (its multiplicative inverse), a different idea.

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The additive inverse of -3/7 is

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