PLEASE HELP ME!!!

Question

PLEASE HELP ME!!!

anonymous · Answer

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 · Answer

A.64cm
B.32cm
C.48cm
D.8cm

anonymous · Answer

@DanJS can you help me please??

rushwr · Answer

are u sure that it V=2rh is the equation shouldn't it have a pi value sum where ?

anonymous · Answer

yeah hold on its

anonymous · Answer

$$V=\pi r ^{2}h$$

anonymous · Answer

and the other one is $$384\pi   $$

rushwr · Answer

if that's so 
$$r ^{2} = \frac{ V }{ \pi h }$$
$$r = \sqrt{\frac{ V }{ \pi h }}$$ Substitute and tell me the answer !!!!!

rushwr · Answer

make sure that u substitute the value with units then u can see pi is getting cancelled off .

anonymous · Answer

i dont know how

rushwr · Answer

Did u get the part how I subjected r ?

anonymous · Answer

because r is the radius and you have to find the radius of the cylinder
thats why

rushwr · Answer

u got that part right? now it's just the substitution and calculation

anonymous · Answer

yeah i got it

rushwr · Answer

|dw:1443164607917:dw| right?