Anne buys used cars at auction for $2000 per car. There is a $150 fee to take part in the auction. If Anne buys 13 used cars, how much does she pay in total?
p=2000x+150 where p is total paid and x is the amount of cars. In this situation, x=13, so you get p=2000(13)+150 to p=26000+150 and finally to p=26150. Therefore, she paid $26,150.