a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.
Answer from: Quest
the mistake in the pattern is that :
b. the decimal point was moved one too many place values each time
the correct pattern could be made by :
b. moving the decimal point to the right the same numbers of place values as the exponents
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