Evaluate the identity function $f\left(x\right)=x$ at $x=\pi$.

A graph shows the horizontal line $y=4$. Which statement correctly describes its domain and range?

Solve for $x$ given $f\left(x\right)=x^2$ and $f\left(x\right)=49$.

Compute $x$ given $\sqrt[3]{x}=-4$.

Explain why f(x) = ∛x has domain all real numbers while f(x) = √x does not. Which mathematical property accounts for this difference?