Chapter 10 - NCPN

20. What is the angle of descent of the airplane Round your answer
to the nearest tenth if necessary. 22.6º
21. In triangle WXY, m∠W = 90º, x = 6.4, and y = 3.7. Find m∠X,
in radians, to the nearest thousandth. 1.047 radians
22. One of the legs of an isosceles right triangle is 10 units long and
the base is 10 2 units long. What is the measure, in degrees,
of the base angles of the triangle Round to the nearest tenth
if necessary. 45º
23. Give three angle measures, in degrees, that have a cosine value of
–0.5. Round your answers to the nearest tenth if necessary.
Answers will vary. sample answers: 120º, 240º, 480º
Mixed Review
24. The geometric sequence $500, , $551.25, $578.81 gives
the amount of money in Fran’s money market at an interest rate
of 5% compounded quarterly. What is the missing amount in
the sequence $525
25. Japanese magnetic levitation trains (maglev) are among the
fastest trains in the world. A maglev train sounds a 320-Hz
whistle while traveling at its top speed. What is the speed of the
train if the whistle is perceived as 550 Hz Round to the nearest
tenth. (Assume that the speed of sound is 760 miles per hour.)
≈ 317.8 mph
10.3 Inverse Trigonometric Functions 453