Does anyone know how to do this?

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

Achild has a box full of colored building blocks. she will choose one block without looking. the odds against choosing a blue block are 4/7. what is the probability of choosing a blue block? amanda is playing a role-playing game with her friends. she will roll dice to determine if her character unlocks a treasure chest. the probability of her character unlocking the treasure chest is 13/20. find the odds in favor of her character unlocking the treasure chest.