4 + 4 - 4/4. The 4/4 simplifies to 1, so you have 4+4 = 8, then subtract 1 is 7.
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( (3x3) +3 ) /3=4
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
How about: 44-(4/4) = 43
4/.4 + 4/4 = 10 + 1 = 11.
In infinitely many ways. However, if you want powers of positive integers only, then you can express 64 as a power of 2, 4, 8 and of 64 itself.