Question

Solve the compound inequality 30 < 10u < 120.

Answer 1

3 < u < 4

3 > u > 12

3 > u > 4

3 < u < 12

Answer 2

Divide through by 10, since all terms are multiples of 10.
30 < 10u < 120.

3 < u < 12
Does that make sense?

Answer 3

when solving these . what you do in the middle you do to the outside so i.e \[\frac{ 30 }{ 10 } < \frac{ 10 }{ 10 }u<\frac{ 120 }{10 }\] then you will have your answer :)