5.624*101
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5.9 × 10-10 written in standard notation is 0.00000000059
39.3 in standard notation = 3.93 x 10^1
8.398 times 10-6 in standard notation = 0.000008398
It is: 4.57*10^9 in scientific notation
2.51 x 10-1 is already in standard or scientific notation.