1d (-5,0) is correct.

2c

3d

4e x may be at most -1 or at least 1.

5a

6c

7e all real numbers except the
square root of 2 and - the square root of 2.

8e $233.33

9c

10e it should be x is greater than or equal to 1
of x=-1.

11d

12a

13a

14c

15c

16d

17a

18d

19d

20b

21a

22e it should be 3/7

23 y=x/2

24 80/9

25 16.8%

26 173.71 years

27a parabola with vertex (3,4), intercepts (0,-5), (1,0), (5,0).

27b (-infinity,4]

27c (-infinity,3]

28 4/11 = 0.3636