Buying one movie ticket online costs $16.50. Two tickets cost $30.50. Assuming that the relationship is linear, what is the recursive formula? (remember recursive formula is An = An-1 + d)

1. An = A1 + (n - 1) +30.50

2. An = An-1 + 14 where A1 = 16.50

3. A20 = 231

4. An = 30.5 + 16.50