This is an example of a closed system
X = -2, x =7 i belive that that is the answer
1 2
if you get asked questions like this just download an app called photo math
Answer:
5
Explanation:
each song costs: 9.95/12 ~ 0.82 each
so with 4.15 u can buy ~ 5.06 songs
so the answer is 5
