a]
[tex](-4)+(-3)=-(4+3)=\boxed{-7}\\\\(-9)+3=-(9-3)=\boxed{-6}\\\\5+(-5)=5-5=\boxed0\\\\(-20)+17=-(20-17)=\boxed{-3}[/tex]
b]
[tex]71+(-10)=71-10=\boxed{61}\\\\(-65)+(-20)=-(65+20)=\boxed{-85}\\\\(-12)+14=14+(-12)=14-12=\boxed2\\\\80+(-20)=80-20=\boxed{60}[/tex]
c]
[tex](-13)+37=37+(-13)=37-13=\boxed{24}\\\\75+(-22)=75-22=\boxed{53}\\\\(-46)+(-34)=-(46+34)=\boxed{-80}\\\\(-25)+59=59+(-25)=59-25=\boxed{34}[/tex]
