Question

@bibby

Answer 1

The number of seats in the first 12 rows of a high-school auditorium form an arithmetic sequence. The first row has 9 seats. The second row has 11 seats.

a) Write a recursive formula to represent the sequence.
b)Write a explicit formula to represent the sequence.
c) How many seats are in the 12th row.

Answer 2

It's an arithmetic sequence. Do you see the addition between seat 1 and seat 2?

Answer 3

No, I'm not sure what you mean

Answer 4

There's an addition being done here.