Stock variables flow variables

match the following in there correct group:
cash at bank
inventory
rent
income for employment
cash in hand

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

2/3(-6y+9x) expand each expression using the distributive property

21 a stick 7 inches long is broken into two pieces, so that one piece is twice as long as the other one. how long are the two pieces?