Why does 5 plus 5 equal 10 please explain why cause "5" and "10" are written differently-

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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