All 4 digit even numbers from 12346

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?

Which best explains why this triangle is or is not a right triangle?

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?