Can someone please help, thank you!

Empty box + box + empty box fill in the box is equal to 30 how

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.

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c