Appendix D - D - Viewing Window and Interpreting Window Settings - Exercise Set - Page 689: 16

Xmin=-50 Xmax=50 Ymin=-20 Ymax=20 Xscl=10 Yscl=4

We know the min and max for both the x-axis and y-axis because it is labelled on the graph. We know the Xscl is 10 because there are five notches between 0 and 50, including 50, meaning each notch must represent ten units. We know the Yscl is 4 because there are five notches between 0 and 20, including 20, meaning each notch must represent four units.