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5.708×10^−8 ​

What is the number in standard form?

5.708×10^−8 ​ = 0.00000005708

hope it helps
10 to the negative 8th power, move the decimal point 8 digits to the left, use 0 when there isn't a digit, then add another 0 to the left of the decimal point. 
0.00000005708