Sorry for the late working, I have been busy (I think... I don't know where the time went)
anyway, I did some searching for a way in which to use WolframAlpha to find the end results. The form is:
Fit[{ (x1, f(x1)), (x2, f(x2)),... (xn, f(xn))}, {1,x, x^2, x^3... x^j}, x] (j is the maximum degree polynomial.
the result for #1 is
THIS
which spits back
0.0208333 x^3-0.2 x^2+0.864167 x+0.005
this can be entered into excel with the x's replaced with the x-values and you will return the exact answer you are looking for, then you can place the xi's (the unknown x's) and you will see what you should expect to get spit back out.
the values look to be a bit off, but within reason...
hope this helps
again, sorry for it taking me so long to get on it
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