I didn’t pay attention in class, help I’ll give 15 points and the crown thing

Answer:
8
Step-by-step explanation:
256 = 64 • 64
64 • 64 = 8 • 8 • 8 • 8
It's the 4th root of 256
The number comes out to 8
Hope this helps! And one more thing...
Next time, pay attention!