- What must be done to categorical variables in order to use them in a regression analysis?

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Can a physicist create his own computer, if he has mastered in Physics? The point A(-3,4) is reflected over the point (-5, 5) and it's image is point B. What are the coordinates of point B? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)? What is the usual temperature at which most glassware are calibrated at? Is 21 close to 30 and 40?