Answer:
11 Β 3/4 miles.
Step-by-step explanation:
Converting to improper fractions, Β the consecutive distances are:
21/4 , 55/8, Β 17/2
= 42/8, 55/8, 68/8 Β for Monday, Tuesday and Wednesday.
So the distances have increased by 13/8 miles each day.
Thus Β number of miles he'll bike on Friday = Β 68/8 + 2(13/8)
= 94/8
= Β 11 Β 3/4 miles.