Answers for Chapter 1 Review of Pre-Algebra

 

pp.43-45

 

1. Each number is 2 times the previous number;

32, 64

 

2. Each number is 7 less than the previous number:

22, 15

 

3. Each number is 1/2 of the previous number;

12, 6

 

4. To get from one term to the next, add 4, then add 5, then add 6, and so on;

23,31

 

5. To get from one term to the next, subtract 15, then subtract 14, then subtract 13, and so on;

51, 40.

 

6. Each number is the sum of the previous two numbers;

59,95.

 

7.  113

 

8.  27

 

9.  83

 

10.  525

 

11.  300

 

12.  17

 

13.  64

 

14.  13

 

15.  512

 

16.  59,049

 

17.  343

 

18.  5.76

 

19.  20.52

 

20.  27

 

21.  45.7

 

22.  22.36

 

23.  13

 

24.  12

 

25.  9

 

26.  9

 

27.  3

 

28.  29

 

29.  5

 

30.  12

 

31.  25

 

32.  -5

 

33.  165 mi

 

34.  Arizona, Maryland, Washington

 

35.  Maryland

 

36.  Washington

 

37.  The figure is not a polygon because it is not closed.

 

38.  The figure is not a polygon because its sides are not all straight.

 

39.  yes, pentagon

 

40.  yes, triangle

 

41. 

n	1	2	3	4	5	6	7	8	9
105 * n	105	210	315	420	525	630	735	840	945

 

The hundreds' digit increases by one each time, while you add five to get from the tens' and units' digit of one number to those of the next.