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Mathematics 18 Online
OpenStudy (anonymous):

Solve the compound inequality 30 < 10u < 120. 3 < u < 4 3 > u > 12 3 > u > 4 3 < u < 12

jimthompson5910 (jim_thompson5910):

Divide each part by 10 so for instance, the middle goes from 10u to u since 10u/10 = 1u = u

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