Use the percent bar model to find the missing percent

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Which of the following shows the length of the third side, in inches, of the triangle below

Given the quadratic function f(x)=3x^2-24x+49 a. use “completing the squares” to convert the quadratic function into vertex form b. state the vertex c. find the x and y intercepts d. graph the function