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I think that the differential equation:
dx/dt = K x (a - x)
is right!

Is there any reason why I should assume here that a=x when t=0 ?

a is the initial concentration

that is a second order process, which involves two substances

awesome.. that's the piece had me confused..

the equation makes sense now.

oh, they are asking to differentiate the expression for dx/dt !
ok, got it :P

yes,
the answer for part b will indeed be
d^2x/dt^2

the wording were confusing!
"for dx/dt" >>> i read it as 'to get dx/dt'

oh right on.. I see .. differentiate the dx/dt .. all good.

well if it confuses you, it must be bad ... lol.

alright.. thanks again you guys.. I got this.. :)

welcome ^_^

Hey Hugh, give one of the Qualified Helpers a rating so they can get their share of OwlBucks!

right on, sorry.. I usually always do that * eventually :)

Thanks.

Thanks hugh!
much appreciated :)