Answer:
0 days: 4
1 day: 4
2 days: 5
3 days: 6
4 days: 6
5 days: 7
10 days: 10
15 days: 15
20 days: 33
25 days: 51
30 days: 79
Step-by-step explanation:
A
the correct answer is A : 2x3-1
-2 by 1
idk