1.2 × 10-3 written in regular notation is 0.0012
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50,010 to the power of 3 in scientific notation = 1.25075015001 x 10^14
3000000000000 = 3 x 10^12; * In countries that use the long scale (based on powers of a million) like Europe: 3 x 10^12 = 3 x (10^6)^2 = 3 billion (the million to the power 2 implies bi-); * In countries that use the short scale (based on powers of a thousand plus one) like USA: 3 x 10^12 = 3 x (10^3)^(3+1) = 3 trillion (the thousand to the power 3 + 1 implies tri-).
3 x 10 to the 5th power + 3 x 10 to the 4th power + 2 x 10 to the 2nd power
The value of 4.2 X 10 to -3 power is 0.0042
(4 - 3) x 10 x 12 - 5 = 115.