The given sequence is: 2, 11, 20, 29, 38, ...

This is an arithmetic sequence, where each term increases by a constant difference.

1. The first term ($a_1$) is the first number in the sequence: $a_1 = 2$

2. The common difference ($d$) is the difference between consecutive terms: $d = 11 - 2 = 9$

Thus:

• $a_1 = 2$
• $d = 9$

Would you like more details on how arithmetic sequences work, or do you have any questions?

Related questions:

1. How can we find the nth term of an arithmetic sequence?
2. How can we calculate the sum of the first n terms of this sequence?
3. What is the difference between arithmetic and geometric sequences?
4. How can we determine if a sequence is arithmetic just by looking at it?
5. Can an arithmetic sequence have a negative common difference?

Tip: In arithmetic sequences, the common difference stays constant throughout the sequence!