To write 4000000 in scientific notation, you would move the decimal point to the left until there is only one non-zero digit to the left of the decimal point. In this case, you would move the decimal point 6 places to the left, resulting in 4.0 x 10^6.
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4,000,000 in Scientific Notation = 4 x 10^6 or 4e+6
You write 0.00007463 in scientific notation as: 7.463 × 10-5
the answer to how to write 87200 in scientific notation is 8.72*10^4
There are probably about half a dozen ways to write this number in scientific notation, but one way to write it, in scientific notation, is 2.4936061x108.
3000 in scientific notation is 3x103.