Arthur D. answered 12/19/16
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1, 8, x, y, 8x, 8y, xy, 8xy
there are 8 factors
there are 3 individual factors, 8, x, and y
2^3=8
if there were 4 individual factors, such as abcd, (a,b,c,d), then there would be 2^4=16 factors