Math
posted by Alice .
Solve the inequality
4 ≤ 2c +7 ≤ 21

4 < = 2 c + 7 < = 21 Subbtract 7
4  7 < = 2 c + 7  7 < = 21  7
 3 < = 2 c < = 14 Divide by 2
 3 / 2 < = 2 c / 2 < = 14 / 2
 3 / 2 < = c < = 7
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