Milo and Cielo want to try out a hiking trail in Vietnam, which has an elevation given by f(x) = 6x3 - 56x2 + 120x + 120 where f is measured in meters above sea level and x represents the horizontal distance along the trail in kilometers, with 0 s x s 5. A mountain pass in Ha Giang | Nhi Dang/Flickr a) State the formula for the average elevation from the lecture notes. b ) Use this formula: What ist the average elevation of the trail