Derivatives-volume of a cyclinder

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SUMMARY

The discussion centers on finding the radius of a cylinder that maximizes volume given the corrected volume formula v = 50r - πr³ and a surface area of 100 cm². Initially, the user presented an incorrect formula that resulted in negative volume values for certain radii. After clarification, the correct equation simplifies the problem significantly, allowing for straightforward application of calculus to determine the optimal radius within the specified range of 0 < r < 3.

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Homework Statement


im just reviewing for a test tomorrow and I am stuck on this question, any help is appreciated

if the volume of a cylinder is v=50-3pir^3, the surface area is 100cm^2 and the range of the radius is 0<r<3, what is the radius that will give the maximal volume?

Homework Equations





The Attempt at a Solution

 
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I don't think you're giving us all the information. Can we assume that this is a circular cylinder? And that formula for the volume is very unusual - it gives negative values for volume when r is greater than about 1.744 cm.

Are you sure you have given us the exact information of this problem?
 
im so sorry, i was using the wrong equation for the volume, is should be v=50r-pir^3, now the question is really easy but thanks for taking your time to help
 

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