The correct way to shut off the computer is to
a. click stop.
b. push the power button on the system unit.
c. click start, then run, and then type shut down.
d. click start and then shut down.

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.