In Problems 25–32, use the given functions f and g.

$$\begin{gathered} \left(a\right)f\left(x\right)=0 \\ \left(b\right)g\left(x\right)=0 \\ \left(c\right)f\left(x\right)=g\left(x\right) \\ \left(d\right)fx>0 \\ \left(e\right)g\left(x\right)\le 0 \\ \left(f\right)f\left(x\right)>g\left(x\right) \\ \left(g\right)f\left(x\right)\ge 1 \\ f\left(x\right)=x^2-4 \\ g\left(x\right)=-x^2+4 \end{gathered}$$

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