#7) How many waves are in this picture?
![7 How many waves are in this picture class=](https://us-static.z-dn.net/files/d43/f6e4dec36831a3e80821f8ff755a9851.png)
Answer:
B.
Explanation:
I don't know much about this subject, but it seems that a wave is when the line is above the line in the middle.