Hey could you me with this maths question you

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

How far could you drive on 50 gallons of gas

What function has a range {yly< 5}? question on picture above^