Exponential Decay : C4 Edexcel January 2013 Q8(b) : ExamSolutions Maths Revision

[loi]

Why isn't it 78 if temperature have to fall to 10oC? Shouldn't it take more time than what we've found?

[mickey]

For the first question the question 'Show that A is a constant' was not proved or is that not a question??

[ExamSolutions_Maths]

Yes I did. Last line of the left hand column.

[gljrgolfer]

Great stuff mate, didnt realise it was just like radioactive physics

[mostinho]

if A= -e^-c
and A = 13
then how can u ever find c? you cant do ln(-13) its a math error

[AudatiousAilbz]

You didn't solve the differential equation...did you?