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Please note: this is not a homework question! It is a real world problem I am trying to solve.

I have some values in mA and tonnes which I need to extrapolate but they are not linear. I know it the mA curve drops off the higher the tonne values go.

I have plotted the values in excel

mA tonne

7.63 42

10.83 84

13.86 126

15.17 147

unknown 210

I have got a logarithmic trend line which is -5.9517ln(x) - 14.903 but I am not 100% sure this is correct?

I then did =(-5.9517*LN(210))-14.903 to get my 210 value but this comes out with a high negative value!

I need to find my predicted mA value at 210tonne.

Can anyone help?

Thanks

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# Non-linear extrapolation graph

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