8: 20
9: 90
I am so sorry if this is wrong. I am not good at this type of things
36 because if you add 21 + 15 you get 36. How by adding it all together. I hope this helped you bye
Answer:
He washed 160 more cars this year than last year.
Step-by-step explanation:
Last year: He washed a total of 1,040 cars.
This year: He washed a total of 1,200 cars.
1,200
<u>- 1,040</u>
160

I'm not sure if you need to simplify