Answer:


Step-by-step explanation:
Given

--- lower diameter
--- upper diameter
Solving (a): The curved surface area
This is calculated as:

Where
--- lower radius
--- upper radius
And
---- l represents the slant height of the frustrum





So, we have:




Solving (b): The volume
This is calculated as:

This gives:





It should be the last one but sorry if i’m wrong
Answer:
3r+5
Step-by-step explanation:
Answer:
IT WOULD HAVE TO BE 8.5
Step-by-step explanation:
AVERAGE IS JUST ANOTHER NUMBER FOR MEAN.
8.5+8.5=17
17/2=8.5
8.5+8.5+8.5=25.5
25.5/3=8.5
1/15. 8/60 simplified down is 1/15