What does the following if statement do?

if (num1 == Math. abs(num1))

Which spereadsheet type will determine how well a bussiness has done over the past year

Which of the following commands is more recommended while creating a bot?

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.