The answer depends on whether xy are commutative numbers or operators in a permutation group.
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The exponential notation for 4 is 4.0 × 100
The exponential notation of 72 is: 7.2 × 101 or 7.2E1
The exponential notation of 0.00001 is 1.0 × 10-5
1 in exponential notation would be 1.0 × 100
0.002983 in exponential notation is: 2.983e-3