There are 20 seats in the front row of theatre. Each successive row contains two more seats than the previous row. If there are 18 rows, how many seats are there in the last row of the theathre?

1. What pattern do the theatre make?
2. How can you find the number of seats in the succeeding rows?
3. How many seats are there in next 4 rows?
4. Can you expect this pattern to continue infinitely? Explain.
5. How can outcomes of certain real life problems be predicted?