Hector used the numerical expression 3.7 + 2.1 + 4.3 to describe the number of miles that he ran in 3 days. How can he rewrite the expression, using both the Associative and Commutative Properties?

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