Question

Solve the inequality. 15 + 12c ≥ 9(c + 15)

Answer 1

15 + 12c $\geq$ 9(c + 15)
15 + 12c $\geq$ 9c + 135
12c $\geq$ 9c + 120
3c $\geq$ 120
c $\geq$ 40

Answer 2

15 + 12c >= 9c + 135
3c >= 120
c >= 40