Matthew haa 18 sets of baseball cards each st has 12 cards about how many baseball card does matthew have

Answer question above and explain each step : )

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

Find the values of y: 3y^3(y^2+ 2/3y)=0