9%

Grade, slopes and percents don't necessarily the same meaning, but definitely center around one main objective: to reach a goal. Even though grade slope and percents don't mean the same, they are still all connected. Slope can be defined as rise over run, or in the case of a road, vertical distance over the horizontal distance. The higher the grade, the steepness of the slope increases and the higher the percentage is for that slope. One can relate this to sine function of trigonometry. This is the best function to use because one can still find the slope of a road without having to know a horizontal distance. To relate this to what we are learning in math, you can find the horizontal run of a right triangle using sine if you know the angle and divide opposite side of the triangle by the hypotenuse (which is the rise).

The grade can effect a slope, which can end up altering the percent, by the amount of effort put in to keeping the slope going. In real life, a grade depends on the amount of effort is put into the slope (or test). If it is clear that one doesn't care and didn't study, they will receive a lower grade (percent) vs. the person who spent countless hours the night before.