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16) -2(4,-2) +3(-3,1) = (-8,4) + (-9,3) =(-17,7)
17) 5(-3,1) +4(4,-2) =(-15,5) + (16,-8) =(1,-3)
18) -2(4-3,-2+1) = -2(1,-1) =(-2,2)
19) 5(2i + 6j) = 10i +30j
20) 2(2i + 6j) + 3(-5i +7j) = (4i+12j) + (-15i +21j) = (-11i +33j)
21) 2(-5i +7j) + 4(2i+6j) = (-10i+14j) +(8i+24j) = (-2i,38j)
22) -5(2i+6j) + 6(-5i+7j) = (-10i, -30j) +(-30i + 42j) = (-40i,12j)