# The University of the State of New York REGENTS HIGH SCHOOL EXAMINATION MATHEMATICS B. Thursday, January 29, :15 a.m. to 12:15 p.m.

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2 Part I Answer all questions in this part. Each correct answer will receive credits. No partial credit will be allowed. For each question, write on the separate answer sheet the numeral preceding the word or expression that best completes the statement or answers the question.  1 The expression cos 40 cos 10 + sin 40 sin 10 is equivalent to (1) cos 30 (3) sin 30 () cos 50 (4) sin 50 Use this space for computations. sec The expression csc is equivalent to (1) sin (3) sin cos () cos (4) cos sin 3 An overhead view of a revolving door is shown in the accompanying diagram. Each panel is 1.5 meters wide. B 1.5 m d 1.5 m C 1.5 m 1.5 m A D What is the approximate width of d, the opening from B to C? (1) 1.50 m (3) 3.00 m () 1.73 m (4).1 m 4 What is a positive value of x for which 9 cos x =? 3 (1) 30 (3) 60 () 45 (4) 90 1 Math. B Jan. 04 []

3 5 The expression is equivalent to 7 3 Use this space for computations. (1) (3) () (4) Jean s scores on five mathematics tests were 98, 97, 99, 98, and 96. Her scores on five English tests were 78, 84, 95, 7, and 79. Which statement is true about the standard deviations for the scores? (1) The standard deviation for the English scores is greater than the standard deviation for the math scores. () The standard deviation for the math scores is greater than the standard deviation for the English scores. (3) The standard deviations for both sets of scores are equal. (4) More information is needed to determine the relationship between the standard deviations. 7 In ABC, a = 19, c = 10, and m A = 111. Which statement can be used to find the value of C? 10 (1) sin C = (3) sin C = 10 sin () sin C = 19 sin 69 (4) sin C = 10 sin If f(x) = and g(x) = 1, then (g f)(x) is equal to x + 3 x (1) 1 + 3x x + 3 x (3) () x x x (4) x Math. B Jan. 04  [OVER]

4 xy Use this space for 9 If log x = a, log y = b, and log z = c, then log is equivalent to z computations. (1) 4a + b + c (3) a + b c 1 1 () ab c (4) a + b c The accompanying diagram shows the elliptical orbit of a planet. The foci of the elliptical orbit are F 1 and F. y F1 F x If a, b, and c are all positive and a b c, which equation could represent the path of the planet? (1) ax by = c (3) y = ax + c () ax + by = c (4) x + y = c 11 Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and the standard deviation is 61 days. Approximately what percent of batteries have lifetimes longer than 561 days? (1) 16% (3) 68% () 34% (4) 84% 1 The expression log 3 (8 x) is defined for all values of x such that (1) x > 8 (3) x < 8 () x 8 (4) x 8 Math. B Jan. 04 

5 3 Use this space for 13 The expression b, b > 0, is equivalent to computations. 1 (1) (3) ( b) 3 3 ( b) 1 3 () 3 (4) ( b ( ) ) b 14 The graph below represents f(x). y x Which graph best represents f(x)? y y x x ( 1 ) ( 3 ) y y x x ( ) ( 4 ) Math. B Jan. 04  [OVER]

6 15 If f(x) = x 3 x, then f(i) is equivalent to (1) + i (3) + i () i (4) i Use this space for computations. 16 Which statement must be true if a parabola represented by the equation y = ax + bx + c does not intersect the x-axis? (1) b 4ac = 0 () b 4ac < 0 (3) b 4ac > 0, and b 4ac is a perfect square. (4) b 4ac > 0, and b 4ac is not a perfect square. 17 A garden in the shape of an equilateral triangle has sides whose lengths are 10 meters. What is the area of the garden? (1) 5 m (3) 50 m () 5 3 m (4) 50 3 m 18 If x is an acute angle and sin x =, then cos x equals (1) (3) () (4) Math. B Jan. 04 

7 19 What is the axis of symmetry of the graph of the equation x = y? (1) x-axis (3) line y = x () y-axis (4) line y = x Use this space for computations. 0 The cells of a particular organism increase logarithmically. If g represents cell growth and h represents time, in hours, which graph best represents the growth pattern of the cells of this organism? g g h h ( 1 ) ( 3 ) g g h h ( ) ( 4 ) Math. B Jan. 04  [OVER]

8 Part II Answer all questions in this part. Each correct answer will receive 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.  1 Kristine is riding in car 4 of the Ferris wheel represented in the accompanying diagram. The Ferris wheel is rotating in the direction indicated by the arrows. The eight cars are equally spaced around the circular wheel. Express, in radians, the measure of the smallest angle through which she will travel to reach the bottom of the Ferris wheel Base Math. B Jan. 04 

9 In the accompanying diagram, point P(0.6, 0.8) is on unit circle O. What is the value of, to the nearest degree? y θ O x P(0.6, 0.8) 3 A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 1 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inversely to their diameters, how many revolutions per minute does the larger pulley make? Math. B Jan. 04  [OVER]

10 4 When a current, I, flows through a given electrical circuit, the power, W, of the circuit can be determined by the formula W = 10I 1I. What amount of current, I, supplies the maximum power, W? 5 The brightness of the star MIRA over time is given by the equation y = sin π x + 6, where x represents time and y represents brightness. 4 What is the period of this function, in radian measure? Math. B Jan. 04 

11 6 A landscape designer is designing a triangular garden with two sides that are 4 feet and 6 feet, respectively. The angle opposite the 4-foot side is 30. How many distinct triangular gardens can the designer make using these measurements? Math. B Jan. 04  [OVER]

12 Part III Answer all 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.  7 Solve algebraically: x = x 8 A board game has a spinner on a circle that has five equal sectors, numbered 1,, 3, 4, and 5, respectively. If a player has four spins, find the probability that the player spins an even number no more than two times on those four spins. Math. B Jan. 04 

13 H 9 The equation for radioactive decay is p = (0.5), where p is the part of a substance with half-life H remaining radioactive after a period of time, t. A given substance has a half-life of 6,000 years. After t years, one-fifth of the original sample remains radioactive. Find t, to the nearest thousand years. t 30 One force of 0 pounds and one force of 15 pounds act on a body at the same point so that the resultant force is 19 pounds. Find, to the nearest degree, the angle between the two original forces. Math. B Jan. 04  [OVER]

14 31 An acorn falls from the branch of a tree to the ground 5 feet below. The distance, S, the acorn is from the ground as it falls is represented by the equation S(t) = 16t + 5, where t represents time, in seconds. Sketch a graph of this situation on the accompanying grid. Calculate, to the nearest hundredth of a second, the time the acorn will take to reach the ground. Math. B Jan. 04 

15 3 In the accompanying diagram of circle O, PA is drawn tangent to the circle at A. Place B on PA anywhere between P and A and draw OA, OP, and OB. Prove that OB is not perpendicular to PA. P A O Math. B Jan. 04  [OVER]

16 Part IV Answer all questions in this part. Each correct answer will receive 6 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.  33 The accompanying table shows the average salary of baseball players since Using the data in the table, create a scatter plot on the grid on the next page and state the exponential regression equation with the coefficient and base rounded to the nearest hundredth. Using your written regression equation, estimate the salary of a baseball player in the year 005, to the nearest thousand dollars. Baseball Players Salaries Numbers of Years Since 1984 Average Salary (thousands of dollars) , ,50 9 1,580 Math. B Jan. 04 

17 Question 33 continued Math. B Jan. 04  [OVER]

18 34 Express in simplest form: 4 x + 8 x + 1 x 3x 15 x 4 x 8x 10 Math. B Jan. 04 

19 Formulas Area of Triangle K = 1 ab sin C Law of Cosines a = b + c bc cos A 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 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 Law of Sines a b c sin A = sin B = sin C Functions of the Double Angle sin A = sin A cos A cos A = cos A sin A cos A = cos A 1 cos A = 1 sin A Functions of the Half Angle sin cos 1 A =± 1 cos A 1 1 cos A =± + A Normal Curve Standard Deviation 19.1% 19.1% 9.% 15.0% 15.0% 9.% 0.1% 0.5% 4.4% 4.4% 0.5% 0.1% 1.7% 1.7% Math. B Jan. 04 

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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

24 MATHEMATICS B Maximum Credits Rater s/scorer s Question Credit Earned Initials Part I Part II Part III Part IV Rater s/scorer s Name (minimum of three) Tear Here Maximum 88 Total Total Raw Checked by Scaled Score Score Notes to raters... Each paper should be scored by a minimum of three raters. The table for converting the total raw score to the scaled score is provided in the scoring key for this examination. The scaled score is the student s final examination score. Tear Here Math. B Jan. 04 

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