Jamal is calculating his cell phone bill. He pays $15.99 per month plus $.50 per long distance call. As a sign up bonus, his phone provider is deducting $5.99 from his bill this month. if Jamal made 23 long distance calls this month, how much is his total phone bill? Use the expression m + .50n - b, when m is the monthly rate, n is the number of long distance calls, and b is the bonus.