Question

What is an in the sequence 5, 10, 15, 20,25...........

Answer 1

a_n = 5n, for n ≥ 1

Explanation:

a_1 = 5

a_2 = 10 = 5 + 5 = a_1 + 5

a_3 = a_2 + 5

a_n = a_(n - 1) + 5

a_n = 5n

Answer 2

this is an arithmetic sequence since every number has 5 in it