You are driving along the highway and see a sign indicating that you are about to enter a downhill slope of 10%. You realize that you are going to travel downward at an angle of degrees to the horizontal. (Enter your answer as a mathematical expression or with at least two digits beyond the decimal point.)
Hint: A descent of 10% means that you are going to descend by 1 foot for every ten feet that you travel in a horizontal direction. The angle of your descent is the acute angle that the highway makes with a horizontal line. Draw a picture and use an inverse trig function.