anonymous
  • anonymous
PLEASE HELP ME!!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
The volume for a cylinder is given by the formula V = r2h, where r is the radius of the cylinder and h is the height of the cylinder. If the volume of a cylinder with a height of 6 centimeters is 384 cubic centimeters, then what is the radius of the cylinder?
anonymous
  • anonymous
A.64cm B.32cm C.48cm D.8cm
anonymous
  • anonymous
@DanJS can you help me please??

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Rushwr
  • Rushwr
are u sure that it V=2rh is the equation shouldn't it have a pi value sum where ?
anonymous
  • anonymous
yeah hold on its
anonymous
  • anonymous
\[V=\pi r ^{2}h\]
anonymous
  • anonymous
and the other one is \[384\pi \]
Rushwr
  • Rushwr
if that's so \[r ^{2} = \frac{ V }{ \pi h }\] \[r = \sqrt{\frac{ V }{ \pi h }}\] Substitute and tell me the answer !!!!!
Rushwr
  • Rushwr
make sure that u substitute the value with units then u can see pi is getting cancelled off .
anonymous
  • anonymous
i dont know how
Rushwr
  • Rushwr
Did u get the part how I subjected r ?
anonymous
  • anonymous
because r is the radius and you have to find the radius of the cylinder thats why
Rushwr
  • Rushwr
u got that part right? now it's just the substitution and calculation
anonymous
  • anonymous
yeah i got it
Rushwr
  • Rushwr
|dw:1443164607917:dw| right?
Rushwr
  • Rushwr
|dw:1443164718936:dw| Cut off the units now !
Rushwr
  • Rushwr
??
anonymous
  • anonymous
is it 32cm?
Rushwr
  • Rushwr
|dw:1443164817921:dw|
Rushwr
  • Rushwr
\[r = \sqrt{\frac{ 384cm ^{2} }{ 6 }} = \sqrt{64cm ^{2}} = 8cm\]
anonymous
  • anonymous
oh i thought it was 64
Rushwr
  • Rushwr
hahahahahah !!!!
anonymous
  • anonymous
can you help me with another one i will medal you this one
Rushwr
  • Rushwr
Did u get it now ?
Rushwr
  • Rushwr
lol no problem. Open up a new question okai ?
anonymous
  • anonymous
yeah but not fully
Rushwr
  • Rushwr
Which part do u find it hard >

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