well, if it is a negative plus a positive, it would be much like subtracting backwards, like this:
-4+7=3 or -11+7=-4
also, if it is a positive plus a negative, you subtract
4+(-7)=-3 or 11+(-7)=4
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what's 8+15=
no, to add and subtract like and unlike fractions the denominator has to be the same,
Yes. A negative subtracted by a negative is a positive. Just remember that two like signs become a positive sign, and two unlike signs become a negative sign.
54453
first find a common denominator then subtract the top numbers