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The number 2,500,000,000 in words is two billion five hundred million.
2,500,000
2.5 billion = 2500000000 = 2.5*10^9
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.
A positive number. Positive Number x Positive Number = Positive Number Positive Number x Negative Number = Negative Number Negative Number x Negative Number = Positive Number