Question

need help on the attachment

Answer 1

if the side of a cube is say
\[x\] then the surface area would be
\[S(x)=6s^2\] if i am thinking straight

Answer 2

well if i was thinking straight i would have written
\[S(x)=6x^2\]

Answer 3

oops this is the wrong problem again, sorry

Answer 4

then if we think that x is a function of t, i.e.
\[x=x(t)\] then
\[S'(t)=12x(t)x'(t)\] by the chain rule

Answer 5

I know that the answer to that problem would be 36