Verona is training for a marathon. The first part of her training schedule is shown below.

Session 1 2 3 4 5 6
Distance Run (mi) 3.5 5 6.5 8 9.5 11

a. If Verona continues this pattern, during which training session will she run 26 miles? Is her training schedule an arithmetic sequence? Explain.

b. If verona's training schedule starts in Monday and she runs every third day, in which day will she run 26 miles?