Answer:
60-12= 48 min. or .8 hours
Step-by-step explanation:
3x-2y+7z-4
Reorder -2y+7z-4
b= -1.5
4/9=2/3 +1/3b
4/9= 6/9+1/3b
-2/9=1/3b
-2/9=3/9b
/-2/9
b= - 1.5