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Question: how to determine the parameter in the function that fit my raw data

Question:how to determine the parameter in the function that fit my raw data

sund0002 34 Maple
May 12 2010
0

I have got two columns of data X and Y. if i know the data would possibly fit a function with form : y=ax^n+bx+c, how could i extract the values of a, b and n? Also, how to get the R squared value for the curve fitting.
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