The number of cars sold weekly by a new automobile dealership grows according to a linear growth model. The first week the dealership sold five cars (P0 = 5). The second week the dealership sold cars (P1=12). Write the recursive formula for the number of cars sold

Write the explicit formula for the number of cars sold, Pn, in the (n+1)th week.

If this trend continues, how many cars will be sold in the fourth week?