We will be using the cosine function to figure this out. The ramp, ground, and platform form a right triangle. The hypotenuse is 29, and the side adjacent to ∠x is 20. SO: Cos ∠x = 20/29 Cos ∠x = 0.68965517241379
Use the function on your calculator to find what angle has a Cos of 0.6896551 Cos 0.6896551 = 46.397°
The answer is C. Here's why, nPr = n!/(n-r)!. Plug in 7 for n and 3 for r. And you get 7!/(7-3)!. Thus, 7!/4! = (7*6*5*4*3*2*1)/(4*3*2*1), which simplifies to 7*6*5 = 210
