What is the difference between operating systems and application software?

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.

In the rgb model, which color is formed by combining the constituent colors? a) black b) brown c) yellow d) white e) blue

Which computer network component connects two different networks together and allows them to communicate? a is a node (or a device) that connects two different networks together and allows them to communicate.