Max owes his brother $20. He gives his brother $10 one week and then the next week he gives $5. Write an addition expression to describe this situation. Then find the sum and explain its meaning.

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

Percent increase and decrease. original number: 45 new number: 18

(60 points) explain this in detail