Given that a = 3 b = - 4 and c = - 2 evaluate each of the following expressions.

(a) 3a-b 3a-C + 2c c-b (b) 2c-a 5a+4c 30+b (c) a+b+2c 5c b-c bc ac (d) + 3c-a-b4b 3c+4b a b