1 is: `y = 21.46800262 + ( 0.000282810868) x_2 - (0.1019284315) x_1 + (0.001671278620) x_1^2` Evaluating the Model In addition, Maple tells us that the normal distance between our model and the actual data is 71.46.  If you live in 249 dimensional space it should be easy for you to visualize