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3) a
4) c
5) b
6) c
2) 3/8 - 5/4 = (12-40)/32 = -28/32 = -7/8
3) 2/5 - 4/3 = (6-20)/15 = -14/15
4) 3(1/4) + 2(3/4) = 13/4 + 11/4 = 24/4 = 6
5) 3(1/5) - 7/15 = 16/5 - 7/15 = (240-35)/75 = 205/75 = 41/15
6) (2/3 - 1/2) + (1/6 - 3/2) = (4-3)/6 + (2-18)/12 = 1/6 + (-16/12) = 1/6 - 8/6 = (1-8)/6 = -7/6
7) (1/6 - 1/2) + (2/9 - 1) = (2 - 6)/12 + (-7/9) = -4/12 - 7/9 = -1/3 - 7/9 = (-9 - 21)/27 = -30/27 = -10/9