How can i change my username

Sarah is having a hard time finding a template for her advertising business that she may be able to use at a later date and also make it available to her colleagues

How do i get the most points, without any effort?

Least square fit to polynomial write a function leastsquarefit3pol that solves a linear system of equations to find a least squares fit of a third order polynomial to an experimental data set given as two row arrays. the function leastsquarefit3pol must explicitly solve a set of linear equations and cannot use polyfit. there should be no restriction on the size of the problem that can be solved.