Why do we use return statements? Choose all that apply A.
Javascript requires functions to have return values.

B.
To return multiple data types simultaneously

C.
To allow a function to give different values depending on input.

D.
So that we no longer have to use console. log();

E.
To save the result of a function in a variable in other functions

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.