Assuming there are an equal amount of houses per street, if there are 18 houses on 3 streets, how many houses are there per street?

How do you answer this question? (step by step)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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.