An algebraic expression
30m-7
The GCF is 7mn..
(3+2) (4+48)
There is no factor of the expression in the question.
4(3m - 4)
7MN
18m-7+12m
The GCF is 7mn.
Not unless m = n.
An algebraic expression
-6
The GCF is 7mn.
If you mean: 12(3+m) then it is the same as 36+12m
2mn + 4n2 and 5m2 - 7mn
12(m+n)
30m-7