# ALGEBRA 2/TRIGONOMETRY

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2 Part I Answer all 27 questions in this part. Each correct answer will receive 2 credits. For each statement or question, choose the word or expression that, of those given, best completes the statement or answers the question. Record your answers on your separate answer sheet. [54] 1 Which survey is least likely to contain bias? Use this space for computations. (1) surveying a sample of people leaving a movie theater to determine which flavor of ice cream is the most popular (2) surveying the members of a football team to determine the most watched TV sport (3) surveying a sample of people leaving a library to determine the average number of books a person reads in a year (4) surveying a sample of people leaving a gym to determine the average number of hours a person exercises per week 2 The expression (2a) 4 is equivalent to (1) 8a 4 (3) 2 a 4 (2) 16 a 4 (4) 1 16a 4 3 Two sides of a triangular-shaped sandbox measure 22 feet and 13 feet. If the angle between these two sides measures 55, what is the area of the sandbox, to the nearest square foot? (1) 82 (3) 143 (2) 117 (4) Expressed in simplest form, is (1) 2 (3) i 2 (2) 7 2 (4) 7i 2 Algebra 2/Trigonometry June 14 [2]

3 5 Theresa is comparing the graphs of y 2 x and y 5 x. Which statement is true? (1) The y-intercept of y 2 x is (0,2), and the y-intercept of y 5 x is (0,5). (2) Both graphs have a y-intercept of (0,1), and y 2 x is steeper. (3) Both graphs have a y-intercept of (0,1), and y 5 x is steeper. (4) Neither graph has a y-intercept. Use this space for computations. 6 The solution set of the equation 2x 4 x 2 is (1) { 2, 4} (3) {4} (2) {2, 4} (4) { } ( ) 2 7 The expression 2 3 x is equivalent to (1) 4 9x (3) (2) 4 3x (4) 4 12 x 9x 4 12 x 6x 8 Which step can be used when solving x 2 6x 25 0 by completing the square? (1) x 2 6x (2) x 2 6x (3) x 2 6x (4) x 2 6x Algebra 2/Trigonometry June 14 [3] [OVER]

4 9 Which graph represents a function? Use this space for computations. y y x x (1) (3) y y x x (2) (4) 10 The expression cot x csc x is equivalent to (1) sin x (3) tan x (2) cos x (4) sec x 11 What is the common difference of the arithmetic sequence below? 7x, 4x, x, 2x, 5x, (1) 3 (3) 3 (2) 3x (4) 3x Algebra 2/Trigonometry June 14 [4]

5 12 If sin θ 0 and cot θ 0, in which quadrant does the terminal side of angle θ lie? (1) I (3) III (2) II (4) IV Use this space for computations. 13 What is the period of the graph y 1 2 sin 6x? (1) π 6 (3) π 2 (2) π 3 (4) 6π 14 What is the product of the roots of the quadratic equation 2x 2 7x 5? (1) 5 (3) 5 (2) 5 2 (4) What is the equation of the circle passing through the point (6,5) and centered at (3, 4)? (1) (x 6) 2 (y 5) 2 82 (2) (x 6) 2 (y 5) 2 90 (3) (x 3) 2 (y 4) 2 82 (4) (x 3) 2 (y 4) 2 90 Algebra 2/Trigonometry June 14 [5] [OVER]

6 16 The formula to determine continuously compounded interest is A Pe rt, where A is the amount of money in the account, P is the initial investment, r is the interest rate, and t is the time, in years. Which equation could be used to determine the value of an account with an \$18,000 initial investment, at an interest rate of 1.25% for 24 months? Use this space for computations. (1) A 18,000e (3) A 18,000e (2) A 18,000e (4) A 18,000e What is the solution set of the equation 1 5? 2 x 9 x 3 (1) {2, 3} (3) {3} (2) {2} (4) { } 18 The graph below shows the average price of gasoline, in dollars, for the years 1997 to What is the approximate range of this graph? (1) 1997 x 2007 (3) 0.97 y 2.38 (2) 1999 x 2007 (4) 1.27 y 2.38 Algebra 2/Trigonometry June 14 [6]

7 19 If f(x) 2x 2 3x 1 and g(x) x 5, what is f(g(x))? Use this space for computations. (1) 2x 2 17x 36 (3) 2x 2 3x 6 (2) 2x 2 17x 66 (4) 2x 2 3x A jogger ran 1 3 mile on day 1, and 2 3 mile on day 2, and miles on day 3, and miles on day 4, and this pattern continued for 3 more days. Which expression represents the total distance the jogger ran? 7 (1) 1 (3) () d d 1 7 (2) 1 () (4) 3 2 d d 1 7 d 1 7 d 1 ( ) ( ) d 1 d 21 If sin x sin y a and cos x cos y b, then cos (x y) is equivalent to (1) b 2 a 2 (3) 2b 2a (2) b 2 a 2 (4) 2b 2a 22 A school math team consists of three juniors and five seniors. How many different groups can be formed that consist of one junior and two seniors? (1) 13 (3) 30 (2) 15 (4) For which value of k will the roots of the equation 2x 2 5x k 0 be real and rational numbers? (1) 1 (3) 0 (2) 5 (4) 4 Algebra 2/Trigonometry June 14 [7] [OVER]

8 24 A cliff diver on a Caribbean island jumps from a height of 105 feet, with an initial upward velocity of 5 feet per second. An equation that models the height, h(t), above the water, in feet, of the diver in time elapsed, t, in seconds, is h(t) 16t 2 5t 105. How many seconds, to the nearest hundredth, does it take the diver to fall 45 feet below his starting point? (1) 1.45 (3) 2.10 (2) 1.84 (4) 2.72 Use this space for computations. 25 The number of possible different 12-letter arrangements of the letters in the word TRIGONOMETRY is represented by (1) 12! 3! (2) 12! 6! (3) 12P 12 8 (4) 12P 12 6! 26 If 2x 3 y, then log y equals (1) log (2x) log 3 (3) 3 log 2 3 log x (2) 3 log (2x) (4) log 2 3 log x 27 Which statement regarding the inverse function is true? (1) A domain of y sin 1 x is [0, 2π]. (2) The range of y sin 1 x is [ 1, 1]. (3) A domain of y cos 1 x is (, ). (4) The range of y cos 1 x is [0, π]. Algebra 2/Trigonometry June 14 [8]

9 Part II Answer all 8 questions in this part. Each correct answer will receive 2 credits. Clearly indicate the necessary steps, including appropriate formula substitutions, diagrams, graphs, charts, etc. For all questions in this part, a correct numerical answer with no work shown will receive only 1 credit. All answers should be written in pen, except for graphs and drawings, which should be done in pencil. [16] 28 In a certain school, the heights of the population of girls are normally distributed, with a mean of 63 inches and a standard deviation of 2 inches. If there are 450 girls in the school, determine how many of the girls are shorter than 60 inches. Round the answer to the nearest integer. Algebra 2/Trigonometry June 14 [9] [OVER]

10 29 The table below shows the concentration of ozone in Earth s atmosphere at different altitudes. Write the exponential regression equation that models these data, rounding all values to the nearest thousandth. Concentration of Ozone Altitude (x) Ozone Units (y) Algebra 2/Trigonometry June 14 [10]

11 30 Solve 2x 3 5 algebraically. Algebra 2/Trigonometry June 14 [11] [OVER]

12 31 Convert 2.5 radians to degrees, and express the answer to the nearest minute. 32 Multiply x yi by its conjugate, and express the product in simplest form. Algebra 2/Trigonometry June 14 [12]

13 33 Solve algebraically for x: log 5x Solve sec x 2 0 algebraically for all values of x in 0 x 360. Algebra 2/Trigonometry June 14 [13] [OVER]

14 35 The function f(x) is graphed on the set of axes below. On the same set of axes, graph f(x 1) 2. y x Algebra 2/Trigonometry June 14 [14]

15 Part III Answer all 3 questions in this part. Each correct answer will receive 4 credits. Clearly indicate the necessary steps, including appropriate formula substitutions, diagrams, graphs, charts, etc. For all questions in this part, a correct numerical answer with no work shown will receive only 1 credit. All answers should be written in pen, except for graphs and drawings, which should be done in pencil. [12] 36 Express in simplest terms: 1 3 x x 2 x Algebra 2/Trigonometry June 14 [15] [OVER]

16 37 Solve x 3 5x 2 4x 20 algebraically. Algebra 2/Trigonometry June 14 [16]

17 38 Whenever Sara rents a movie, the probability that it is a horror movie is Of the next five movies she rents, determine the probability, to the nearest hundredth, that no more than two of these rentals are horror movies. Algebra 2/Trigonometry June 14 [17] [OVER]

18 Part IV Answer the question in this part. A correct answer will receive 6 credits. Clearly indicate the necessary steps, including appropriate formula substitutions, diagrams, graphs, charts, etc. A correct numerical answer with no work shown will receive only 1 credit. The answer should be written in pen. [6] 39 Two forces of 40 pounds and 28 pounds act on an object. The angle between the two forces is 65. Find the magnitude of the resultant force, to the nearest pound. Using this answer, find the measure of the angle formed between the resultant and the smaller force, to the nearest degree. Algebra 2/Trigonometry June 14 [18]

19 Tear Here Tear Here Area of a Triangle K _ 1 ab sin C 2 Functions of the Sum of Two Angles sin (A + B) sin A cos B + cos A sin B cos (A + B) cos A cos B sin A sin B tan A + tan B tan (A + B) 1 tan A tan B Functions of the Difference of Two Angles sin (A B) sin A cos B cos A sin B cos (A B) cos A cos B + sin A sin B tan A tan B tan (A B) 1 + tan A tan B Law of Sines a sin A b sin B c sin C Reference Sheet Law of Cosines a 2 b 2 + c 2 2bc cos A Functions of the Double Angle sin 2A 2 sin A cos A cos 2A cos 2 A sin 2 A cos 2A 2 cos 2 A 1 cos 2A 1 2 sin 2 A tan 2A 2 tan A 1 tan 2 A Functions of the Half Angle sin _ 1 2 A 1 cos A 2 cos _ 1 2 A 1 + cos A 2 tan _ 1 2 A 1 cos A 1 + cos A Sum of a Finite Arithmetic Series S n n(a 1 + a n ) Sum of a Finite Geometric Series 2 S n a 1(1 r n ) Binomial Theorem 1 r (a + b) n n C 0 a n b 0 + n C 1 a n 1 b 1 + n C 2 a n 2 b n C n a 0 b n n (a + b) n nc r a n r b r r = 0 Algebra 2/Trigonometry June 14

20 Tear Here Tear Here

21 Tear Here Tear Here Scrap Graph Paper This sheet will not be scored.

22 Scrap Graph Paper This sheet will not be scored. Tear Here Tear Here

23

24 ALGEBRA 2/TRIGONOMETRY Printed on Recycled Paper ALGEBRA 2/TRIGONOMETRY

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