Yesterday you borrowed $40 from your brother. every day that you don't pay it back, you owe $.50 more. so today, day one, you owe him $40.50, on day two you will owe him $41.00, on day three you will owe him $41.50, etc. if you still haven't paid him back, how much will you owe him on day 17?

Since you cumulate $0.50 with each passing day, after days you owe your brother more dollars.

So, after 17 days, you owe him

extra dollars, for a total of

Step-by-step explanation:

To determine at what unit rate the turtle is crawling, divide 3/20 mile by 1/6 hour.

Therefore, the unit rate is 9/10 of a mile per hour.