What is the 25th term of this arithmetic sequence? 3, 9, 15, 21, 27, ...

3, 9, 15, 21, 27, ...

+6 + 6 + 6 + 6

a (n) = a₁ + d (n - 1)

a (n) = 3 + 6 (n - 1)

a (n) = 3 + 6 (n) - 6 (1)

a (n) = 3 + 6n - 6

a (n) = 6n + 3 - 6

a (n) = 6n - 3

a (n) = 6n - 3

a (25) = 6 (25) - 3

a (25) = 150 - 3

a (25) = 147