please quick!!!!1

Question

There are 8 seats in the first row of a theater, 12 seats in the second row, and 16 seats in the third row. This pattern continues for each row in the theater. Write a rule for an​​ , the number of seats in the nth row.

Answer 1

It's an arithmetic sequence with a common difference, d, = 4

A1 = 8

A2 = 8+4 = 12

A3 = 12+4 = 16 = 8+4(3-1) = 8+4(2) = 8+8

AN = A1 + d(N-1)

AN = 8 +4(N-1) = the Nth term in the sequence