Question
Let $ f: \mathbb{R} \to \mathbb{R} $ be defined by $ f(x) = \begin{cases} 2x, & x > 3 \\ x^2, & 1 \leq x \leq 3 \\ 3x, & x \leq 1 \end{cases} $. Then $ f(-1) + f(2) + f(4) $ is
Let $ f: \mathbb{R} \to \mathbb{R} $ be defined by $ f(x) = \begin{cases} 2x, & x > 3 \\ x^2, & 1 \leq x \leq 3 \\ 3x, & x \leq 1 \end{cases} $. Then $ f(-1) + f(2) + f(4) $ is