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Mathematics 23 Online
OpenStudy (anonymous):

find the middle number: -13 and 21= -32 and 24= -38 and -18= 25 and 61=

OpenStudy (anonymous):

21 - -13 = 34 divide this by 2 and add to lowest number (-13) so you middle number is -13 + 17 = 4 solve the rest in a similar way

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