9868483883888 Because 9-6=3, 6-4=2, 4-3=1, 3-3=0 decreasing orderand 8,8,8,88,888 in this pattern.
64
328+8+8+8=32
With your brain.
If you mean 8x8x8x8, that would be 84 Yes I agree. I just came from math classes and this is correct.