text: in hexadecimal arithmetic, adding 8f and 80ff makes a sum of    (a)- ff8e    (  b)ff8f (c) - 816f  (d) -  818e   (d) - 818e  you can use your windows calculator to figure this out. start up the calculator. (start - programs - accessories) select "view" select "scientific" click on the button next to "hex"  then do your math.  when you're in hex mode, you can enter letters.