First 5 numbers in the sequence. (7, 12, 17, 22, 27)
Explicit formula. (an = 2 + 5n)
Recursive formula and the first term. (an = an-1 + 5,  a1 = 7)

First 5 numbers in the sequence.
n^th term.
Common difference.
Which term is x.
Recursive formula.
Explicit formula.
Sum of the first n terms.
Whether x is a term in the sequence.