Elizabeth City State University Elizabeth City, North Carolina27909 STATE REGIONAL MATHEMATICS CONTEST COMPREHENSIVE TEST BOOKLET

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1 Elizabeth City State University Elizabeth City, North Carolina STATE REGIONAL MATHEMATICS CONTEST COMPREHENSIVE TEST BOOKLET Directions: Each problem in this test is followed by five suggested answers. When you have decided which of the suggested answer is correct, shade the corresponding circle on the answer sheet. Sample question: = A) 6 B) 7 C) 16 D) 12 E) None of these Sample answer: B C D E Answer A is marked since the difference between 54 and 48 is 6. You will have 80 minutes to work on the 40 questions in this test booklet.

2 1. Suppose four people weigh on average 120 lbs., and a fifth person weighing 130 lbs. joins them, the average weight of all five people is: A) 125 B) 128 C) 126 D) 122 E) None of these 2. The sum is equal to A) B) C) D) E) None of these 3. In the following circle, AB bisects CD at point E. If CD = 8 and AE = 2, then the radius is: A C E D B A) 3 B) 4 C) 5 D) 6 E) None of these 4. sin tan A) B) 1 C) D) E) None of these 5. Assume that the radius of the earth is 3960 miles. A coast guard plane 5 miles above the earth spots a boat miles away. Which formula below represents? A) B) C) D) E) None of these 6. Which of the following is the largest? A) 8 B) 8 C)2 D) 4 E) 16 2

3 7. In the figure below, the radius of the circle is 6 cm, what is the area of the triangle? A) 18 3 cm 2 B)36 3 cm 2 C)72 3 cm 2 D)108 3 cm 2 E) cm 2 8. A weight attached to a spring is pulled down 3 inches below the equilibrium position. Assuming that the frequency of the system is 6/π cycles per second, determine a trigonometric model that gives the position of the weight at time t seconds. A) 3 cos 12 B) 3 cos 12 C) 3πcos6 D) 3cos 6/ ) E) None of these 9. The Joshua Family took a summer trip by road and had 2 breaks. The first trip segment was covered in 3 hours, the second 80 mile segment was also covered in 3 hours, and the third 130 miles long segment took 2 hours. Suppose the overall average speed of the trip was 40 mph, how longer was the second segment than the first one. A) 45 miles B) 50 miles C) 60 miles D) 30 miles E) None of these 10. Of the seven points (9,17), (6,11), (3,5), (7,12), (3.5,6), (5,10), (5,9), five lie on a straight line. Which two do NOT lie on that line? A) (5,10) and (7,12) B) (3,5) and (5,9) C) (9,17) and (7,12) D) (6,11) and (3,5) E) (3.5,6) and (5,9) 11. A cube is painted blue on all faces. If the cube is cut into 216 smaller cubes of equal sizes, how many smaller cubes have only one blue face? A) 6 B) 12 C) 48 D) 96 E) Complete the identity: tan 1 tan 1 sec tan A) 2 B) tan C) 0 D) 1 E) None of these 3

4 13. An examination consists of three parts. In part I, a student must answer 3 of 4 questions. In part II, a student must answer 6 of 8 questions and in part III, a student must answer all 5 questions. How many choices of questions does the student have? A) 120 B) 288 C) 112 D) 124 E) None of these 14. Given that What is when A) 4096 B) 6440 C) 8064 D) 5044 E) None of these 15. The interior angle of a regular polygon is 144 degrees. If the length of a side is 12 units, what is the perimeter? A) 80 B) 100 C) 120 D) 140 E) The expression sin sin cos cos A) cot B) cot C) tan D) tan E) None of these 17. You have 600 feet of fencing to enclose a rectangular plot of land that borders on a river. If you do not fence the side along the river, what is the largest area that can be enclosed in square feet? A) 40,000 B) 90,000 C) 45,000 D) 50,000 E) None of these 18. Given the function 1 1, what is the slope of the line segment at? A) 3 B) 2 C)1 D) 2 E) None of these 19. In the figure below, the chord AB of length 6 subtends an angle of 90 at the center of the circle. Find the area of the shaded region. A) 12 6 B) 9 2 /2 C) D) E) None of these 4

5 20. Simplify cos cos 3 sin sin 3 A) tan 2 B) 2tan2 C) cot 2 D) 2cot2 E) None of these 21. Let R be a rectangle having one side of length 2 and an area of 12. Let T be a second rectangle that has a diagonal of length 15 and is similar to rectangle R. The area of T is A) 9 10 B) 27 10/4 C) 9/2 D) 36 E) None of these 22. Given below is the graph of the function, for what values of will the graph of 2 be zero? A) (, 4) ( 2,0) (2, ) B) (, 4) (0,1) (2, ) C) (, 4) (2, ) D) (, 4) (4, ) E) None of these 23. Given two similar triangles, the area of the larger triangle is sixteen times the area of the smaller triangle. Find the ratio of the perimeter of the larger triangle to the perimeter of the smaller triangle. A) 8 1 B)4 1 C) 16 1 D) 32 1 E) Find an equation for the graph. A) y = cos 3x B) y = cos 9x C) y = sin 9x D) sin 3x 5

6 25. In Elizabethan City in April 2010, the average lowest temperature 33 F was observed at 2:00 AM and the average highest temperature 51 F was observed at 2:00 PM. Assume this average temperature followed a sine graph, with t = hours after 8:00 AM. Which of the following represents the average temperature from 8:00 AM that day for 24 hours? 2 2 A) 42 18sin t B) 42 18sin t C) 42 9sin t D) 42 9sin t E) None of these The sum of all positive integers between 50 and 350 whose units digit is a 1 is A) 5880 B) 5539 C) 5488 D) 4877 E) The below is an isosceles triangle with 3 and 4. D is a point on and is a point on such that 5. If the area of is half of the area of, what is the length? A E B C D A) 3 B) 2 C) 1 D) 0.5 E) None of these 28. Find an equation for the graph. A) y = 5 sin (x/3) B) y = 5 sin 3x C) y = 5 sin(x/5) D) y = 5 sin 5x 29. Four large and 2 small pumps can fill a swimming pool in 2 hours. Two large and 6 small pumps can also fill the same swimming pool in 2 hours. How long does it take 8 large and 8 small pumps to fill 50% of the swimming pool? (ASSUME: all the large pumps have same power and all the small pumps have the same power). A) 20 minutes B) 15 minutes C) 25 minutes D) 45 minutes E) None of these 6

7 30. The sum of the solutions of the equation is A) 3 B) 2 C) 1 D) 6 E) The figure below is a square. What is the ratio of the shaded area to the unshaded area? x 3x A)1 3 B)1 6 C) 1 5 D)2 9 E) None of these 32. The solutions of tan sec 1 are: A) /6, /2 B) /3, 5 /3 C) 7 /6, 11 /6 D) 3 /4, 2 /3 E) None of these 33. A certain brand of razor blades comes in packages of 6, 12, and 24 blades costing $2, $3, and $4 per package, respectively. A store sold 12 packages containing a total of 162 razor blades and took in $35. How many packages of the 12 blades per package were sold? A) 5 B) 6 C) 8 D) 3 E) None of these 34. Determine the value of for which 5 is A) 28 B) 7 C) 8 D) 30 E) In the triangle ABC, ACB = 120, AC = 8 and BC = 4. The bisector of ACB meets the side AB at the point D. Find the length of CD. A) 2/3 B) 4/3 C) 8/3 D) 1 E) None of these 36. 7

8 A) cos x B) sec x C) sin x D) csc x 37. A man can commute to work by either subway or bus. If he takes the subway in the morning, he returns on the bus in the afternoon, and if he returns in the afternoon on the subway, he took the bus in the morning. Over a period of weekdays, the man took the bus to work in the morning 9 times, returned home by bus in the afternoon 13 times, and commuted by subway a total (either morning or afternoon) of 18 times. The value of is A) 23 B) 22 C) 21 D) 20 E) cannot be determined from the information provided 38. What are the last two digits of 7? A) 07 B) 01 C) 49 D) 43 E) None of these 39. In the triangle, altitude meets altitude at. Suppose 8, 6, and 4. What is the length of? A) 1 B) 2 C) 3 D) 1/2 E) 5/2 40. A painter needs to cover a triangular region 60 meters by 68 meters by 72 meters. A can of paint covers 64 square meters. How many cans will be needed? A) 30 cans B) 40 cans C) 308 cans D) 25 cans E) None of these 8

9 Answers: 1. D 2. B 3. C 4. A 5. A 6. C 7. D 8. A 9. D 10. A 11. D 12. A 13. C 14. A 15. C 16. D 17. C 18. C 19. B 20. C 21. C 22. A 23. B 24. A 25. C 26. A 27. C 28. B 29. C 30. B 31. C 32. B 33. D 34. D 35. C 36. C 37. D 38. A 39. C 40. A 9