What form(s) of documentation is (are) required in all assignments using outside sources?
works cited
parenthetical citation
both of the above
either parenthetical citation or works cited, but not both

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what is the image?

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