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OpenStudy (anonymous):
help again
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OpenStudy (anonymous):
@jigglypuff314
OpenStudy (anonymous):
Ooh calculus my favorite
OpenStudy (anonymous):
So what's the formula for the SA of a cube?
OpenStudy (anonymous):
And what's Ds/dt
jigglypuff314 (jigglypuff314):
Surface Area of Cube = 6 s^2
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OpenStudy (anonymous):
I was asking the guy who needed help because ya know...
OpenStudy (anonymous):
Anyways, ds/dt is 4m/ps
OpenStudy (anonymous):
So derive the formula 6s^2
OpenStudy (anonymous):
with respect to t
OpenStudy (anonymous):
im so confused
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OpenStudy (misty1212):
HI!!
OpenStudy (anonymous):
hi
OpenStudy (anonymous):
So do you know how to derive?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
Derive 6s^2
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OpenStudy (misty1212):
you get that the surface area of a cube with side say "\(x\)" is \[S(x)=6x^2\] right ?
OpenStudy (misty1212):
so
\[S'=12 x x'\] by the chain rule
you are told \(x=12,x'=4\) plug in the numbers that is all
OpenStudy (anonymous):
so it would be 48 ?
OpenStudy (misty1212):
lol no
OpenStudy (anonymous):
no...
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OpenStudy (misty1212):
multiply!!
OpenStudy (anonymous):
192?
OpenStudy (anonymous):
No let's plug it in 1 by 1...
So you have 12(12(x')
so then you plug in that which is 4
So it becomes 12(12)(4)
OpenStudy (anonymous):
576
OpenStudy (anonymous):
@alisyed5865 can you help me with another question and also thank you @misty1212 and @@alisyed5865 for the help
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OpenStudy (anonymous):
yEAH SURE
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