Question

ajudemmmmmmmmmmm me!!!!!!!!!

Answer 1

a)(+12)+(+21)=                                b)(+13)+(+7)=
       +12+21=                                          +13+7=
             33                                                 20

c)(+23)+(+21)=                                  d)(-12)+(-11)=
      +23+21=                                           -12-11=
         44                                                     -23
 
e)(-23)+(-4)=                                       f)(-21)+(-12)=
      -23-4=                                               -21-12=
         -27                                                   -33

g)(+10)+(-13)=                                    h)(+21)+(-12)=
      +10-13=                                              +21-12=
         -3                                                       +9

i)(+40)+(-17)=
     +40-17=
        +23
  

Espero ter ajudado!