Robyn opened a bank account to save her birthday money. It was paying 3.75% interest. Then the interest rate went up by 0.65%. How much is her new interest rate? A:3.10%

B:4.30%

C:4.40%

D:10.25%

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