1) 9-(-7+4)-15-(-1.2) = 9-(-3)-15+1.2 = 9+3-15+1.2 = -1.8
2) 91.3-100-15-12.5-(-3) = 91.3-100-15-12.5+3 = -33.2
3) 3.8-(-0.2)-15+(-9) = 3.8+0.2-15-9 = -20
4) -7.2--0.8-(-2) = -7.2+0.8+2 = -4.4
1) 9-(-7+4)-15-(-1.2) = 9-(-3)-15+1.2 = 9+3-15+1.2 = -1.8
2) 91.3-100-15-12.5-(-3) = 91.3-100-15-12.5+3 = -33.2
3) 3.8-(-0.2)-15+(-9) = 3.8+0.2-15-9 = -20
4) -7.2--0.8-(-2) = -7.2+0.8+2 = -4.4