2^ x 521
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1.29 x 10-8.
5,200 in standard index form = 5.2 × 103
2.9 million in standard index form = 2.9 × 106
1250 in standard index form = 1.25 × 103
7 x 7 x 7 is the expanded form of 343. The proper index form of this exponent would be73