Karis and Ryan are filling up their cars with gas. Karis already had 5 gallons and is filling up her tank at a rate of 0.7 gallons per second. Ryan already had 3 gallons and is filling up his tank at a rate of 0.9 gallons per second. How long will it take for them to have the same amount of gas in their tanks?

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.