Please help me with this question by using matlab to successfully run it.Plase add the comments Thank you for your help

[30 Points] Consider question 1 instead using cubic splines with free run-out. Find the interpolated value at r = 0.9. Using the same function y(r) = 1/(1 + 25x?) to generate the data points, find the interpolated values for a cubic spline using 21 equally spaced data points from a = -1 to 1. Plot the polynomial. %3D