Answer:
14 hours
Step-by-step explanation:
7h - 5(3h-8) = -72
7h - 15h + 40 = -72
-8h +40 = -72
-8h = -72 -40
-8h = -112
h = -112/ -8
h = 14
Gemma
9 X 150 = 1350
61000/100 X 2 =1220
add together $2570
Fred
14350/100x2=287
200 + 287 = $487
Erik
4 X 160 = 640
153000/100 X 2.5 = 3825
3825 + 640 = $4465
Allison
510000/100x0.5 = $2550
Your 5 changes your slope