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marigirl
 one year ago
Can you help me find an expression for h please
marigirl
 one year ago
Can you help me find an expression for h please

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marigirl
 one year ago
Best ResponseYou've already chosen the best response.0SO far i have \[\frac{ 40x }{ r }=\frac{ 40 }{ 20 }\]

phi
 one year ago
Best ResponseYou've already chosen the best response.1assuming h is the height of the cylinder

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0What must the radius of the cylinder be to give the cylinder the maximum volume is my question..

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0\[v=\pi r^2 h\] so an expression to sub into h

phi
 one year ago
Best ResponseYou've already chosen the best response.1I am not awake! the proportion is \[ \frac{40h}{r}= \frac{40}{20} \]

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0ok great so i was on the right track. ill go ahead and differentiate now :)

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0why did u choose 40h .....where as i did 40x

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0or are we talking about the same things?

phi
 one year ago
Best ResponseYou've already chosen the best response.1it depends what you mean by "x" I used h because h is the height of the cylinder

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0so then when you did 40h you meant 40height of cylinder...so we are left with the top part of cylinder

phi
 one year ago
Best ResponseYou've already chosen the best response.1once we have that relation we can solve for h \[ \frac{40h}{r}= 2 \\ 40h= 2r \\ h= 402r \]

marigirl
 one year ago
Best ResponseYou've already chosen the best response.0oh yup i get it now. thanks heaps!
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