SOLUTION: 1
1/f=1/v+1/u.....please make f,v and u the subject of the formula.show working.
2
calculate the volume of the material used in π20cm long with internal diameter 6cm and 
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Question 1027470:  1
1/f=1/v+1/u.....please make f,v and u the subject of the formula.show working.
2
calculate the volume of the material used in π20cm long with internal diameter 6cm and external diameter 8cm .take π=22/7.  
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
 
The others are solved the same way.
Then work it the same way and
Same way
.
.
.
What is the object? A tube?
Please repost with additional information. 
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