Resuelve las siguientes adiciones.

a. ( ̶ 30 ) + 12 =

b. 28 + (–13) =

c. –567 + 45 =

d. –36 + 15 =

e. –680 + (–47) =

f. 34 + (–123) =

g –240 + (–87) =

h. 189 + (–230) =

i. –24 + 24 =

j. 189 + (–189) =