- + 10.8 is: rational irrational

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

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

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