Answer:
Will you try to please repost it so i can better answer it and try to reword it some because it's a bit confusing for those who want to help me
Since 20 is a factor of 40, the least common denominator of 3/20 and 9/40 is 40.
1. In a week there are 7 days. So your andwer would be 21/10. The decimal is 2.1.
1407.43cm³ V=πr2h=π·82·7≈1407.43351cm³
