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4.0 × 10-2 written in standard notation is 0.040
The scientific notation for 800 is 8 x 10^2. In scientific notation, a number is expressed as a product of a coefficient (which is greater than or equal to 1 and less than 10) and a power of 10. In this case, 8 is the coefficient and 10^2 represents "times 10 raised to the power of 2," which is 100. So, 8 x 10^2 is equal to 800.
20000
2,400,000 is 2.4*10^6 in standard form or scientific notation
1.92*10-2