Two enterprising college students decide to start a business. They will make up and delivery helium balloon bouquets for special occasions. It will cost them $44.45 to buy a machine to fill the balloons with helium. They estimate that it will cost them $1.53 to buy the balloons, helium, and ribbons needed to make each bouquet. Write down the expression that could be used to model the total cost for producing b balloon bouquets.