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2. a) [latex]17+ (-5)=12[/latex] [latex](-19)+ 3=-16[/latex] [latex](-7)+ 7=0[/latex] b) [latex](-6) + (-12)=-18[/latex] [latex]24 + (-9)=15[/latex] [latex]32 + (-17)=15[/latex] c) [latex](-8) + (-5) + 4=4+(-13)=-9[/latex] [latex]49+(-15) + (-17)=49+(-32)=17[/latex] [latex](-29) + 48 + (-32)=48+(-61)=-13[/latex] d) [latex]-8 + 72=64[/latex] [latex]-205 + 69=-136[/latex] [latex]-207 + 260=53[/latex] ===================== 3. [latex]-84+17=-67[/latex] [latex]-84+100=16[/latex] [latex]-84+84=0[/latex] [latex]-84+(-29)=-113[/latex] ===================== 4. a) [latex](-2,7) +1,3=-1,4[/latex] [latex](-1,4)+ 5=3,6[/latex] [latex](-4,9) + (-3,7)=-8,6[/latex] [latex]12,1 + (-5,8)=6,3[/latex] c) [latex]7 frac{1}{4} + left(-5frac{3}{5} ight)=7 frac{5}{20} + left(-5frac{12}{20} ight)=6frac{25}{20} + left(-5frac{12}{20} ight)=1 frac{13}{20}[/latex] [latex]-9frac{3}{4}+3frac{11}{12}=-9frac{9}{12}+3frac{11}{12}=-8frac{21}{12}+3frac{11}{12}=-5 frac{10}{12}=-5 frac{5}{6}[/latex] [latex]-6,8+4frac{1}{2}=-6,8+4,5=-2,3[/latex] [latex]6,9+left(-4frac{7}{20} ight)=6,9+(-4,35)=2,55[/latex]