How many different paths are there from (1,2) to (4,7) if i can only go up/right? calculator

If a client wants to make minor edits, what should he/she use?

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.

Which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard