help needed with wrong questions
http://prntscr.com/zfsdg

Question

help needed with wrong questions 
http://prntscr.com/zfsdg

anonymous · Answer

can you tell me is the answer correct

anonymous · Answer

is that your working below the question???

tkhunny · Answer

Assume everything changes uniformly?

$\Delta$Linear Distance is a factor of 2
$\Delta$Surface Area is a factor of 2^2 = 4
$\Delta$Volume is a factor of 2^3 = 8

anonymous · Answer

yea i dont get qhat is the maistake there can you please show me the working

tkhunny · Answer

What working?  71*8 = ??

anonymous · Answer

i did the solution please tell me what to do

anonymous · Answer

is it really wrong

tkhunny · Answer

$71 = \dfrac{4}{3}\pi r^{3}$

What is $\dfrac{4}{3}\pi (2r)^{3}$

anonymous · Answer

where i have stated 2r^2

anonymous · Answer

ka please you tell me what's wrong with the answer

anonymous · Answer

i got 568 as the answer when i worked it out.....if it is correct i would explain how i arrived at it....

anonymous · Answer

ok

anonymous · Answer

is my answer correct??

mertsj · Answer

Whoops.  width doubled.  New calculation.

anonymous · Answer

oh this not good yesterday say i did it with factor of 2 but one of viewer said to do it by the factor of 4 i did it 4 the one i did with 2 http://prntscr.com/zchy0 see when i did it this way my teacher said its wrong

anonymous · Answer

do you have the answer to the question??

anonymous · Answer

no sorry

anonymous · Answer

i do not if i am right but i this is how i worked it out.....

anonymous · Answer

knowing that the volume of any object ids directly proportional to the cube of any of its length,
in symbols,$$V  \alpha     l ^{3}$$

mertsj · Answer

Yes.  You are correct.  If the length doubles, the surface area is multiplied by 4 and the volume is multiplied by 8.

anonymous · Answer

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