HELP‼️
what are the 3 main types of propulsion systems in areonautics.

The can be used to paste text in any order

Which of the following “invisible” marks represents an inserted tab?

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.