Write an expression and evaluate.
Sam earns time and a half for the hours he works over 38 hours a week. If he worked 42 hours last week and usually earns an $8 an hour, how much did he earn in overtime?

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.