Question

Is the sequence "7, 17, 27, 37..." arithmetic? If so, what is the formula?

Answer 1

Assuming your initial term has an index of `0` then
`color(white)("XXX")a_i = 7+10i`

Explanation:

The initial term is `a_0 = 7`
The second term is `a_1 = 7+10`
The third term is `a_2 = 7 +10xx2`
and so on.