Sarah used the repeated addition problem below to show problem 5+5+5+5+5 which multiplication problem did he solve

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

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.