RELEASED. Student Booklet. Precalculus. Fall 2015 NC Final Exam. Released Items

Transcription

1 Released Items Public Schools of North arolina State oard of Education epartment of Public Instruction Raleigh, North arolina Fall 2015 N Final Exam Precalculus Student ooklet opyright 2015 by the North arolina epartment of Public Instruction. ll rights reserved.

2 P RELULUS I TEMS 1 What transformations have occurred to create the function f(x) = 3x 3 4 from the function g(x) = x 3? The graph of the function has been stretched horizontally and shifted up four units. The graph of the function has been stretched vertically and shifted up four units. The graph of the function has been stretched horizontally and shifted down four units. The graph of the function has been stretched vertically and shifted down four units. 2 n object is launched straight upward from ground level with an initial velocity of 50.0 feet per second. The height, h (in feet above ground level), of the 2 object t seconds after the launch is given by the function ht () = 16t t t approximately what value of t will the object have a height of 28.0 feet and be traveling downward? 2.39 seconds 1.84 seconds 1.56 seconds 0.73 seconds 3 What is the range of the function [ 5, ) (, 5] (, 5] (, ) f( x) = 5 2( x + 3 ) 2? 1 Go to the next page.

3 P RELULUS I TEMS 4 wind that is blowing from the northwest toward the southeast can be represented by a vector. The vector has an eastward component and a southward component. If the eastward component has a magnitude of 5.00 miles per hour and the southward component has a magnitude of miles per hour, in what direction is the wind blowing? The wind is blowing in the direction 71.6 east of south. The wind is blowing in the direction 67.5 east of south. The wind is blowing in the direction 22.5 east of south. The wind is blowing in the direction 18.4 east of south. 5 What value of x satisfies the equation log 3( x 4) = 2? man is standing on level ground 50 feet away from the wall of a building. He looks up at a window on the building. The angle of elevation to the bottom of the window is He then looks up at the top of the building. The angle of elevation to the top of the building is 35. What is the approximate distance between the bottom of the window and the top of the building? 5.7 feet 7.9 feet 8.3 feet 8.5 feet 2 Go to the next page.

4 P RELULUS I TEMS 7 Triangle WXY has the following properties: The angle at vertex W is 14, and the angle at vertex X is obtuse. The side opposite vertex W has a length of 7.00 units. The side opposite vertex X has a length of 9.00 units. What is the approximate length of the side opposite vertex Y? 1.73 units 2.08 units 3.26 units 5.40 units 8 onsider these two trigonometric functions: f( x) = 3sin(2 x) + 4 ( x π ) gx ( ) = 3sin How should the graph of f be shifted to produce the graph of g? Shift the graph of f to the left π units to produce the graph of g. 4 Shift the graph of f to the right 4 π units to produce the graph of g. Shift the graph of f to the left 2 π units to produce the graph of g. Shift the graph of f to the right 2 π units to produce the graph of g. 3 Go to the next page.

5 P RELULUS I TEMS 9 The maximum height, in inches, a ball reaches after its first four bounces is shown in the table below. ounce Number Height (in inches) Which type of function best models the data and why? an exponential function, because the height of the ball is decreasing by 25% with each bounce an exponential function, because the height of the ball is decreasing by 75% with each bounce a logistic function, because the height of the ball is decreasing by 25% with each bounce a logistic function, because the height of the ball is decreasing by 75% with each bounce 10 What is the inverse function of g(x) = x 3 2? 1 3 ( ) = + 2 g x x 1 3 ( ) = 2 g x x 1 3 ( ) = + 2 g x x 1 g ( x) = x 2 ( ) Go to the next page.

6 P RELULUS I TEMS 11 What are the polar coordinates of the point ( 2 3,2 3 ), ( 2 6,150 ) and ( 2 6, 210 ) ( 2 6,135 ) and ( 2 6, 315 ) ( 2 6,120 ) and ( 2 6, 240 ) where 0 θ 360? ( 2 6, 30 ) and ( 2 6, 330 ) 12 Which equation is the rectangular form of the polar equation x 2 + 4y = 4 x 2 + y 2 = 4 y 2 + 4x = 4 y 2 4x = 4 r = 2? 1 + cosθ 5 Go to the next page.

7 P RELULUS I TEMS 13 Two parametric equations are shown below, where t 0. x y 1 3 = t + = 3 2 4t 7 Which nonparametric equation can be used to graph the curve described by the parametric equations? y y y y = 4 9 ( x + 1) 7 = 4 3 ( x + 3) 7 = 4 36( x 1) 7 = 4 324( x 3) 7 14 The formula for a sequence is shown below. a = 2a + 3, a = 3 n n1 1 Which is another formula that represents the sequence? f(n) = 3(2 n 1) f(n) = 2n 3 3n 2 + 8n + 3 f(n) = 2(n 2 + 1) f(n) = 3n 2 + 8n 1 6 Go to the next page.

8 P RELULUS I TEMS 15 When a 1 = 25,000, what is the sum of the infinite sequence defined by the equation a a? n + = 125, , , , What is the end behavior of the function n lim - f ( x ) 0 and lim f( x) x = x = lim - f ( x ) 0 and lim f( x) 100 x = x = lim - f ( x ) 1 and lim f( x) x = x = lim - f ( x ) 1 and lim f( x) 100 x = x = f( x ) = 100? 1 + 5(0.75) x 7 Go to the next page.

9 P RELULUS I TEMS 17 In the piecewise function below, k is a constant. f( x) = 2 2 x k, x =/ x k 4 k, x = k k What is the value of the limit lim f ( x )? x k 0 2k 2k Limit does not exist What is the value of m( x 3x + 7) li? x 3 Limit does not exist. 8 Go to the next page.

10 P RELULUS I TEMS 19 What is the approximate measure of angle x in the triangle below? x The temperature, in degrees F, of the water in a large fish tank is modeled by the function Tx ( ) = ln(1 + x) , where x is the number of pebbles in the tank. pproximately how many pebbles are in the tank if the water is 58.3 F? Go to the next page.

11 P RELULUS I TEMS 21 series is shown below Which statement is true about the sum of the series? The series converges to 7 3. The series converges to 5 2. The series converges to 5 3. The series diverges. 22 circle is graphed using the parametric equations shown below. x = 5cos(t) + 3 y = 5sin(t) 1 Where is the center of the circle located? ( 3, 1) ( 3, 1) (3, 1) (3, 1) 10 Go to the next page.

12 P RELULUS I TEMS 23 The polar coordinates of a point are of the point? ( 3, 3 3) 6, 4π 3. What are the rectangular coordinates ( 3, 3 3 ) ( 3, 3 3) ( 3, 3 3 ) 11 Go to the next page.

13 P RELULUS I TEMS This is the end of the Precalculus Released Items. irections: 1. Look back over your answers for the test questions. 2. Make sure all your answers are entered on the answer sheet. Only what is entered on your answer sheet will be scored. 3. Put all of your papers inside your test book and close the test book. 4. Place your calculator on top of the test book. 5. Stay quietly in your seat until your teacher tells you that testing is finished. 6. Remember, teachers are not allowed to discuss items from the test with you, and you are not allowed to discuss with others any of the test questions or information contained within the test. 12