Kendra is buying an outfit that is on sale for 20% off. The original price of the outfit is $109. What is the sale price?
1)$130.80
2)$87.20
3)$78.20
4)$21.80

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