Doesn't Understand

Eric jogged

3 1/4 miles on Monday,

5 5/8 miles on Tuesday, and

8 miles on Wednesday.

Suppose he continues the pattern for the remainder of the week.

How far will Eric jog on Friday?

$\begin{array}{lrrll} \text{Monday} & 3 & \frac{2}{8} & \text{ miles} \\ &&&& +2\frac{3}{8}\\ \text{Tuesday} & 5 & \frac{5}{8} & \text{ miles} \\ &&&& +2\frac{3}{8}\\ \text{Wednesday} & 7 & \frac{8}{8} & \text{ miles} \\ &&&& +2\frac{3}{8}\\ \text{Tursday} & 9 & \frac{11}{8} & \text{ miles} \\ &&&& +2\frac{3}{8}\\ \text{Friday} & 11 & \frac{14}{8} & \text{ miles} \\ \end{array}$

Eric will jog on Friday $11\frac74 \ \text{miles}$

Eric jogs 2 3/8 miles each additional day. So, on Thursday he will jog: 8 + 2 3/8=10 3/8, and on Friday he will jog: 10 3/8 + 2 3/8 =12 3/4 miles.