1. Yes.

3. Increasing

5. y = –1.5x – 6

7. y = –2x – 1

9. No.

11. Perpendicular

13. (–7, 0); (0, –2)

15. y = –0.25x + 12

17.

19. 150

21. 165,000

23. y = 875x + 10,675

25. a) 375
b) dropped an average of 46.875, or about 47 people per year
c) y = –46.875t + 1250

27.

29. Early in 2018

31. y = 0.00455x + 1979.5

33. r = 0.999