Question 1201824
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Go to web-site 


https://www.easycalculation.com/statistics/cubic-regression.php


Use free of charge online calculator there.



Input your data and get a Cubic Regression Equation immediately.



Other similar web-sites


https://www.storyofmathematics.com/math-calculators/cubic-regression-calculator/


https://planetcalc.com/5992/


and, probably, tens others, that you can find using Google search 
with keywords "cubic regression online calculator".