PLEASE show how to do it in MATLAB, PLEASE include codes of matlab

Question 1 (20\%): Consider the points {(1,1),(2,2),(3,0),(4,2),(5,0)} a) (5%) Calculate a cubic polynomial approximation using polyfit. a) (10%) Calculate a polynomial approximation using Lagrange. c) (5\%) Plot all approximations in the same plot including the data points