To determine the type of sequence represented by the number of pages Elena read each day, we can look at the differences between the pages read each day:
- Pages read on Monday: 84
- Pages read on Tuesday: 93
- Pages read on Wednesday: 102
- Pages read on Thursday: 111
Let's calculate the differences between consecutive terms:
- Difference between Tuesday and Monday: \( 93 - 84 = 9 \)
- Difference between Wednesday and Tuesday: \( 102 - 93 = 9 \)
- Difference between Thursday and Wednesday: \( 111 - 102 = 9 \)
Since the differences are constant (all equal to 9), this means the sequence of pages read is an arithmetic sequence where the common difference is 9.