If by this you are saying 4.25*10^3, a scientific notation type question, think of what 10^3 is. That would be 1 followed by 3 zeros, or 1000, so 4.25*10^3 = 4.25*1000 = 4250
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425 ÷ 2 = 212.5 and 425 ÷ 3 = 141.67, so no, 425 is not divisible by 2 or 3.
10 to the power 3 means 10*10*10, or 1000 10 to the power MINUS 3 means 1 over 10 to the power 3, so 1/1000.
13
425
10 to the power of 3. 103