Answer:
look at the explanation and both pictures
Step-by-step explanation:
Time Snowball
x ---------------- y
0 ---------------- 0
1 ----------------- 1
2 ---------------- 2
3 ---------------- 3
4 ---------------- 3
5 ---------------- 3
6 ---------------- 3
7 ---------------- 3
8 ---------------- 3
9 ---------------- 6
10 --------------- 9
11 ---------------- 12
12 --------------- 15
13 --------------- 18
14 --------------- 21
15 --------------- 24
