7. (1 pt) What is the reference angle for the angle 140? 8. (1 pt) Angles of depression and elevation are always measured from a line to the ground. 9. (2 pts) State two distinct Pythagorean triples: and 10. (1 pt) If the period of a function is 4.5 radians, what is its frequency? 11. (1 pt) (True / False) sin(x + 2x) = sin x for values of X.15. (1pt) Find the area of a triangle where ZA = 73.8, b = 7 ft, and c = 13 ft. A. 172.9 ft2 B. 32.90 ft2 C. 50.27 ft2 D. 43.69 ft2 16. (1pt) Find the measure of LR to the nearest degree. The picture is not necessarily drawn to scale. R 5 3 P A. 90 B. 1450 C. 2.09 D. No Solution 17. (1pt) Which of the following pairs express the same graph? A. f (x ) = 3 sin ( 0 - 7 ) B. f(x) = 3 sin(20 - It) c. f(x) = 3sin (20 -5) D. f (x) = -3 sin(0 - It) g(x) = 3cos (0) g(x) = -3cos (20) g(x) = -3cos (20) g(x) = 3cos (0)