SOLUTION: An auditorium has.7 seats in the first row. 11 seats in the second row.15 seats' I n third row. How many seats in seventh row?

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Question 999570: An auditorium has.7 seats in the first row. 11 seats in the second row.15 seats' I n third row. How many seats in seventh row?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
You can see that each row has four more seats than the row in front of it, so
7,11,15,19,23,27,31
or
a(7) = a(1) + (n-1)d
a(7) = 7 + 6(4) = 31