Answer:
45 
Step-by-step explanation:
Multiply 9 · 10 = 90 then divided by 2 = 45
I honestly don't know, but I think it is 63
Answer:
Lori would have to save $5,760
Step-by-step explanation:
Since 320×6=1920, you would have to add to see witch number would be best to save up too. You would get $5,760 when you multiple by 3.If you multiple by 2,it wouldn't give you enough money.
Answer:
The answer is B ⇒ 
Step-by-step explanation:
∵ v = π r² h
∴ r² = 
∴ r = 
∵ r = 10 ft and h = 15 ft
∴ 