You evaluate the powers of 10 and a exponent of positive 4.
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The exponent in this case is the small number written in superscript (raised) to the right of the 10.
Yes. Any positive number to an exponent is positive.
To change a number from standard to scientific notation, move the decimal point to create a number between 1 and 10. Count the number of places you moved the decimal point to get the power of 10. If you moved it to the left, the exponent is positive, and if you moved it to the right, the exponent is negative.
24: the number of digits is always one more than the exponent of 10 if the exponent is positive.
It is 2.5/(10*10*10*10) or 2.5*0.0001