Answer: A) -131B) 1C) 442D) -42 -213Step-by-step explanation:Properties we use to solve problems related ti INTEGERS:For sum :a +(-b)=a-b -a-b=-(a+b)For product :(+)(+)= (+)(+)(-)=(-)(-)(-)=(+)A) -11+(-120) = -11 -120 [∵ a +(-b)=a-b]= -(11+120) [∵ -a -b=-(a+b)]= -131 B) 18+(-17) = 18-17 =1 [∵ a +(-b)=a-b]
C)+13(+34) = +442 [(+)(+)= +]
D) -15+(-27)
= -15-27 [∵ a +(-b)=a-b]= -(15+27) [∵ -a -b=-(a+b)]= -42
E) +56+(+27)
= 56+27=83
F)-32+(-181) = -32-181 [∵ a +(-b)=a-b]= -(213) [∵ -a -b=-(a+b)]= -213