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Write each of the following rational numbers with positive denominators: 5/ –8 , 15/ –28 , –17/ –13.

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We can write, 5/-8 = 5 x (-1)/-8 x (-1) = -5/8 [multiplying numerators and denominators by (-1)]

15/-28 can be written as = 15 x (-1)/-28 x (-1) = -15/28

and -17/-13 can be written as = -17 x (-1)/-13 x (-1) = 17/13, as both negative signs are cancelled.

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