Corey deposits $300 in a bank that pays 4% annual interest. how much interest does corey earn in one year? what would the interest be if the rate were 6%?

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