When using scientific notation, you shift the decimal place over until there is only one digit in front of the decimal place and count how many times the decimal moved. 55,000 would be 5.5x10^4 because the decimal moved over four spots to the left. If the number was .00055 then the answer would've been 5.5x10^-4 because the decimal moved 4 places to the right.
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5.5 X 10^4
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.