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Problem

Determine whether 7, start superscript, 2, m, end superscript, dot, 6, start superscript, 2, m, end superscript is equivalent to each of the following expressions.
 
Equivalent
Not equivalent
49, start superscript, 9, m, end superscript
42, start superscript, 6, m, end superscript
42, start superscript, m, end superscript
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