2) 6.8 - 7 + 8 / 5.4 - 6.7
= -0.2 + 1.48 - 6.7
= -5.42

4) 0.6(-9) - 3.6 / -1.5 4
= -5.4 - (-9.6)
= -5.4 + 9.6
= 4.2