Find the tangent plss help..

Which function has the same domain as y=2x

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?

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points