574 CHAPTER 5 Trigonometric Functions 5.4 Exercises CONCEPT PREVIEW Match each equation in Column I with the appropriate right triangle in Column II. In each case, the goal is to find the value of x. I 1. x = 5 cot 38° 2. x = 5 cos 38° 3. x = 5 tan 38° 4. x = 5 csc 38° 5. x = 5 sin 38° 6. x = 5 sec 38° II A. 5 x 38° B. 5 38° x C. 5 x 38° D. 5 x 38° E. 5 x 38° F. x 5 38° CONCEPT PREVIEW Match the measure of bearing in Column I with the appropriate graph in Column II. I 7. 110° 8. S 20° W 9. N 70° W 10. 270° 11. 180° 12. N 70° E II A. N S 20° E W B. N S 70° E W C. N S 20° E W D. N S 70° E W E. N S 180° E W F. N S 90° E W Concept Check Refer to the discussion of accuracy and significant digits in this section to answer the following. 13. Lake Ponchartrain Causeway The world’s longest bridge over a body of water (continuous) is the causeway that joins the north and south shores of Lake Ponchartrain, a saltwater lake that lies north of New Orleans, Louisiana. It consists of two parallel spans. The longer of the spans measures 23.87 mi. State the range represented by this number. (Data from www.worldheritage.org) 14. Mt. Everest When Mt. Everest was first surveyed, the surveyors obtained a height of 29,000 ft to the nearest foot. State the range represented by this number. (The surveyors thought no one would believe a measurement of 29,000 ft, so they reported it as 29,002.) (Data from Dunham, W., The Mathematical Universe, John Wiley and Sons.)
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