Alan wants to earn at least $68 trimming trees. He charges $8 per hour and pays $4 in equipment fees. What are the possible numbers of hours Alan could trim trees?

Answer 1

8h-4≥68 (h is for hours)

8h-4+4≥68+4 (add 4 on both the sides)

8h≥72

h≥9 (divide 8 on both the sides)

Therefore, Alan has to trim trees for at least 9 hours to earn profit of at least $68.

Answer 2

68 ≤ 8x - 4

72 ≤ 8x

9 ≤ x

nine or more hours are required to earn $68.00 or more