77)
f(x) = x-1
g(x)= x³
f ° g = x³ - 1
g ° f = (x-1)³
78)
f(x) = (x+1)²
g(x) = x/5
f ° g = (1/25)*(x+5)²
g ° f = (1/5)*(x+1)²
88
y = -(-2/x) = 2/x
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