Answer
a) $95$ b) $127$
c) $17$ and d) $1$
Work Step by Step
a) $(f \space o \space g)(4)=f(g(4)); \\ f(31) =(3)(31)+2=95$
b) $(g \space o \space f)(2)=g(f(2)); \\ g(8) =(2)(64)-1=127$
c) $(f \space o \space f)(1)=f(f(1)); \\ f(5) =(3)(5)+(2)=17$
d) $(g \space o \space g)(0)=g(g(0)); \\ g(-1)=2-1=1$
Hence, a) $95$ b) $127$
c) $17$ and d) $1$
