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18. From a boat on the lake, the angle of elevation to the top of a cliff is 15 54'. If the base of the cliff is 967 feet from the boat, how high is the cliff (to the nearest foot)? (5 points) B i U Font Family AVADE EE .GOVB 19. Find the exact value of arccos (sin ( * )). For full credit, explain your reasoning. (5 points) B i U Font Family 20. A person is watching a boat from the top of a lighthouse. The boat is approaching the lighthouse directly. When first noticed, the angle of depression to the boat is 16 23'. When the boat stops, the angle of depression is 49 29' . The lighthouse is 200 feet tall. How far did the boat travel from when it was first noticed until it stopped? Round your answer to the hundredths place. (5 points) B i U Font Family5. Factor the algebraic expression below in terms of a single trigonometric function. cos x - sin 2x -'| (2 points) 3. Find all solutions to the equation. 7 sin2x - 14 sin x + 2 = -5 (4 points)5. Write the expression as either the sine, cosine, or tangent of a single angle. (2 points) COS W/H cos + sin w/a sin