(1)
(a) f(4)=6*16-20+8=84
(b) f(-3)=6*9-5(-3)+8=54+23=77
(c) g(-11) = (-11+5)/3 = -6/3 = -2
(d) g(1) = (1+5) / 3 = 2
(2)
(a) (f+g)(-3) = 2(-3) + 7 + 7(-3) -6 = 9(-3) + 1=-26
(b) (f-g)(5) = 2*5+7-7*5+6 = -5*5 + 13 = -12
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