The ramp measures 9 feet long and is 3 feet from the ground. What is the slope of the ramp?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?