the answer is 430,000,000 if the exponent is positive ;)
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64.3 times 10 to the power of -8 in scientific notation is written as: 0.000000643
It is already in scientific notation as 4.9*10^8 and it is equivalent to 490,000,000
The scientific notation of 0.0000000039 is 3.9 times 10 to the power of 9. 3.9 times 109.
In scientific notation 2.445*10^3 is equivalent to 2445
7 times 105 = 700000 700000 in scientific notation is 7 times 10 to the power of 5.