Don’t understand sb help

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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.