Answer:
3 classes
Step-by-step explanation:
The teacher can schedule 3 classes in a night because 4 1/2 divided by 1 1/2 is 3.
hope this helps!!
The alphabet has 26 letters
1.8 - 0.2x = -1.6 Subtract 1.8 on both sides
1.8 - 1.8 - 0.2x = -1.6 - 1.8
-0.2x = -3.4 Divide -0.2 on both sides

x = 17