Answer:
Well we need to see the axis of rotation there must be a picture or something to depend on since you provided very few information or whatsoever.
If your picture of information has the cone cut from the middle then it's a circle and if it's from top to bottom it's an isosceles triangles.
Here's a picture I found on the internet to help you understand it better ^-^
Sorry if I didn't help but Good luck!
Eleven adult chaperones will be needed
Answer
Find out the percent error in Annie's estimate .
To prove
Formula

As error = approx value - exact value
As given
Annie estimates that the height of a bookcase is 78.25 in.
The actual height is 75.50 in.
approx value = 78.25 in.
actual value = 75.50 in.
error = 78 .25 - 75 .50
= 2.75
put in the formula


Percentage error = 3.64 % (approx)
Therefore the Percentage error be 3.64 % (approx).
I would say 22 i first looked at amount of average kids in a class then tried every number close. 484/22=22
24:32 is the ratio. Just add up he total number and then put the total number of student over the total number of people