When working overtime, an auto mechanic gets paid 1.5 times the normal hourly wage. overtime is the amount of time worked beyond 40 hours a week. the auto mechanic's normal hourly wage is $21.00. last week, the auto mechanic worked 46 hours.

part a. write an expression to represent the amount of money earned last week.
part b. evaluate the expression you wrote in part a. ( the auto mechanic earned last week.)