$\text{a)}{D}_f=⟨-7,-1)\cup ⟨0,5⟩$  

$Z{W}_f=⟨-3,4⟩$  

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$\text{b)}f\left(-4\right)\cdot \left[f\left(-2\right)-f\left(5\right)\right]=4\cdot \left(-3-1\right)=4\cdot \left(-4\right)=-16$  

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$\text{c)}⟨-4,-2⟩,⟨3,5⟩$  

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$\text{d)}⟨-7,-3)\cup ⟨0,5⟩$