5*103 = 5,000
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To write 2.289 x 10-3 in standard notation, you simply move the decimal point three places to the left, because the exponent is negative. This gives us the value of 0.002289.
5.9 × 10-10 written in standard notation is 0.00000000059
4.53*10-6 0.00000453 is in standard notation just move the decimal place over how ever many times the exponent is on the 10
The problem you have shown is in scientific notation, in standard notation, you're looking at 34.
39.3 in standard notation = 3.93 x 10^1