The price tag on a shirt says $21.50. the final cost of the shirt, including taxes, is $23.22. the equation 21.50+t equals23.22 can be used to find the amount of sales tax t in dollars. what is the sales tax.

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.