The inequality can be:
Now you divide both sides by 150 to get the #of boxes.
Lastly, x is 20. So the maximum amount of boxes that the freight elevator can hold is 20
y=-3 and then x=-1 =-3:-1
Angle a is 22.62 degrees
and
angle b is 67.38 degrees
47/9+110/15=705/135+990/135=1695/135=12 15/27