0. Functions

State the inputs and outputs of the following relation. Is it a function? $\{(-3,5),(0,2),(3,5)\}$

State the inputs and outputs of the following relation. Is it a function? {$\(\left\)(2,5\(\right\)),\(\left\)(0,2\(\right\)),\(\left\)(2,9\(\right\))$}

Find the domain and range of the following graph (write your answer using interval notation).

If $f\left(x\right)=2x^2+1$, what is the value of $f\left(3\right)$?