Write the first six terms of the sequence beginning with the term a1. Then calculate the first

Question:

Write the first six terms of the sequence beginning with the term a1. Then calculate the first and second differences of the sequence. State whether the sequence has a perfect linear model, a perfect quadratic model, or neither.
1. a1 = 0
an = an-1 + 3
2. a1 = 2
an = an-1 + 2