When driving mountain roads, road signs often indicate the steepness of the road as a % grade which represents the angle of elevation as the road rises. Imagine your job is to collect or measure the data that is needed to determine the % grade of mountain roads in a certain region of the U.S. Which of these quantities is needed for you to be able to use arcsine to calculate the % grade? Select all that apply.
a) The length of a section of the road
b) The angle of depression
c) The horizontal distance travelled
d) The change in elevation along a section of road