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Use linear approximation, i.e. the tangent line, to approximate ` root(3)( 125.1 ) ` as follows:
Let ` f(x) = root(3)(x) `. The equation of the tangent line to ` f(x) ` at ` x = 125 ` can be written in the form ` y = mx+b `

where ` m ` is:  
and where ` b ` is:  

Using this, we find our approximation for ` root(3)(125.1) ` is  

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