Answer: A) -131
B) 1
C) 442
D) -42
-213
Step-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
