Question

Answer this question​

Answer 1

(1) a-(-b)=a+b ~ 21-(-18)=21+18

(2) a-(-b)=a+b ~ 118-(-125)=118+125

(3) a-(-b)=a+b ~ 75-(-84)=75+84

(4) a-(-b)=a+b ~ 28-(-11)=28+11

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it is from ncert course

and its formula will be this add in the answer

a-(-b)=a+b

Answer 2

Answer:

21 +18=39

118+125=243

75+84=159

28+11=39

hope it will help you