Answer: You will run 2.53125 miles on Friday.
Explanation:
Sunday: 0.5 miles
Monday: 0.5 miles * 1.5 = 0.75 miles
Tuesday: 0.75 miles * 1.5 = 1.125 miles
Wednesday: 1.125 miles * 1.5 = 1.6875 miles
Thursday: 1.6875 miles * 1.5 = 2.53125 miles
Friday: 2.53125 miles * 1.5 = 3.796875 miles