Answer:
See below.
Step-by-step explanation:
For each day number, Y means working, and N means off
Day
1   Y
2   Y
3   Y
4   N
5   N
6   N
7   N
8   Y
9   Y
10   Y
11   Y
12   N
13   N
14   N
15   Y
16   Y
17   Y
18   N
19   N
20   N
21   N
22   Y
23   Y
24   Y
25   Y
26   N
27   N
28   N
29   Y
30   Y
31   Y
32   N
33   N
34   N
35   N
36   Y
37   Y
38   Y
39   Y
40   N
41   N
42   N
43   Y
44   Y
45   Y
46   N
a. Today is day 1. 30 days from today is day 31.
She works on day 31, so she does work 30 days from today.
b. 45 days from today is day 46. She is off on day 46, so she will be off 45 days from today.
 
        
                    
             
        
        
        
Answer:
The common side is B-E.
Step-by-step explanation:
The only side that they have the same is B-E.