Question one is answer 3.
I don't know about cylinders as much. Sorry!!!
Answer:
n=5/3
Step-by-step explanation:

simplified it would be 5/3
(If you wouldn't mind, if this helped you, please give brainliest, I'm trying to get an achievement)
Answer:
9 blocks
Step-by-step explanation:
It is 798.75 without rounding off the nearest cent.
Answer:
Blank 1: 1 Blank 2: 8 Blank 3: 72
Step-by-step explanation:
What it is basically saying is that 9*8 is equal to 10*8 - 1*8 [Blank 1]. 10 times any number is a friendly number, it all ends with a 0. The question is saying that it is easier to think of a friendly number and subtracting from that. 10 eights - 9 eights is equal to 1 eight. So we take away 1*8=8 from 10*8=80, or in other words, 80-8 [Blank 2]= 9*8=72 [Blank 3].
Are you starting to see what I mean?