What does a equal in this problem

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

According to the data set, where should the upper quartile line of the box plot be placed?

Which expression is rational? 6. , square root two, square root 14, square root 49