2.5 x 109 is wrong.
2.5 x 109 would be "2500000000
The correct answer is 2.5 x 1010 or 25 x 109 (But this would not be in true scientific notation). Scientific notation is basically calculated by how many times you would move the decimal point (as a result of multiplying by 10). As follows.
2.5 x 109 = 2500000000
2.5 x 1010 = 25000000000
Not sure how old this question is but thought i would answer anyway.
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It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".
This number in scientific notation is 9.8x10-5.
It is: 2.7*10^0 in scientific notation
thirty three and one third percent of twenty five billion dollars =$833250000033 1/3% of $25000000000= 33.33% * $25000000000= 0.3333 * $25000000000= $8332500000