Answer:
.9
Step-by-step explanation:
If the number behind that place is 5 or greater than you round up one but if it is 4 or below than you keep the number the same.
The difference between 11.0 and 12.5 is 1.5 and same with 12.5 and 14.0, so 1.5 is what the hair increases by every THREE months but if you want to find PER month, you are going to divide 1.5 by those 3 months to get .5 inches per month, so your slope will be 1/2