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Exercises 16.6, page 464

1. 13
3. $- 90$
5. 0
7. $- 40$
9. 120
11. 22
13. 57
15. $- 13$
17. $- 36$
19. 0
21. $x = - 1, y = 0, z = 2, t = 1$
23. $x = 1, y = 2, z = - 1, t = 3$
25. $x = 2, y = - 1, z = - 1, t = 3$
27. $D = 1, E = 2, F = - 1, G = - 2$
29. 0
31. 8
33. $\frac{33}{16} A, \frac{11}{8} A, - \frac{5}{8} A, - \frac{15}{8} A, - \frac{15}{16} A$
35. ${20.8 km}^{2}$
37. ppm ${SO}_{2} :$ 0.5, NO: 0.3, ${NO}_{2} :$ 0.2, CO: 5.0

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