Find a formula for the nth term of the arithmetic sequence

Question

First term: 1

common difference: 4

Answer 1

Formula for the nth term of an arithmetic sequence: an = a1 + (n-1)d

a1 = first term = 1

d= difference = 4

an = 1 + (n-1)4

an = 1 + 4n -4

an = 4n - 3