2.5*1010*3.5*(10-7) = 26512.5
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a positive... for example: -5x-5=25
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.
The product of 25 and 3 is 75. In mathematics, the product is the result of multiplying two or more numbers together. In this case, when you multiply 25 by 3, you get 75 as the answer.
1010
2.9% is the same as 0.029 and 0.029*25 = 0.725