MATH 115 Precalculus Summer, 2017, V3.1 25. From a point 48 feet from the base of a redwood tree, the angle of elevation to the top of the tree is 56.30. Find the height of the tree to the nearest foot. Show work. (sketch is not to scale) 56.30 48 feet 26. For the triangle ABC, we are given that A = 420, B = 58, and c = 16.0. 420 580 C = 16 B Find the length of side a, rounded to the nearest tenth. Show work. 27. Let u = (16, 4) and v = (2, -8). (b) Calculate the dot product u . v. Show work. (c) Determine the angle between u and v. Round the result to the nearest degree. Show work. (x - 8)2 () + 1)2 28. An ellipse has the equation = 1 16 100 (a) Is the major axis horizontal or vertical? (b) Find the exact values of the foci of the ellipse. Show work. Page 7 of 7