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Additive Identity & Additive Inverse

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What must be subtracted from −3 to get −9?

(a) −6
(b) 12
(c) 6
(d) −12

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Solution

(c) 6
(−3) − x = −9
∴ x = (−3) + 9 = 6
Hence, 6 must be subtracted from −3 to get −9.

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