Hey! Ok so with this problem, you can figure out the pattern with subtraction.
If you convert the fractions to decimals you get 3.25 and 5.625. 5.625 - 3.25 = 2.375, which means he increased his run by 2.375 miles. 8 - 5.625 = 2.375 as well, which follows the pattern. So what you would need to do from here is add 2.375 miles for each day he jogged.
8 + 2.375 = 10. 375, the miles he jogged on thursday. 10.375 + 2.375 = 12. 75, the miles he jogged on friday.
So, when converted to fractions, your answer is D: Eric jogged 12 3/4 miles on Firday
