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Mathematics (1 Viewer)

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well gradient = m and m = gradient function. So find the derivative (e^x lol) and put 0.213 = e^x then its ln(0.213) = x AND PRESTO your done. TOTALLY 13 characters i do ext. 2 maths (i would know)
You are stupid because you differentiated it, the whole point of the question was pretty much to realise you could do it without differentiation.
 

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