$\text{a)}Z{W}_f=(-\infty ,3⟩$  

$Z{W}_g=(-\infty ,2⟩$  

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$\text{b)}f\left(x\right)=g\left(x\right)\iff x\in \left\{-8,-1\right\}$  

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$\text{c)}\left(f\left(x\right)<0\wedge g\left(x\right)<0\right)\iff x\in \left(-\infty ,-6\right)\cup \left(-2,5\right)$  

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$\text{d)}f\left(x\right)>g\left(x\right)\iff x\in \left(-8,-1\right)$