Posted by Elizabeth on Thursday, August 23, 2012 at 1:35pm.
yes.
The two expressions are equivalent, since m+m = 2m
That said, I'd interpret
"product of 9 and twice m" as 9(2m)
and
"product of 9 and the sum of m and m" as 9(m+m)
That would leave open the possibility of something like
"product of 9 and the sum of m and k" as 9(m+k)
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