# ALGEBRA I (Common Core) Thursday, January 28, :15 to 4:15 p.m., only

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2 Part I Answer all 24 questions in this part. Each correct answer will receive 2 credits. No partial credit will be allowed. Utilize the information provided for each question to determine your answer. Note that diagrams are not necessarily drawn to scale. 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. [48] 1 In the function f(x) (x 2) 2 4, the minimum value occurs when x is Use this space for computations. (1) 2 (3) 4 (2) 2 (4) 4 2 The graph below was created by an employee at a gas station Which statement can be justified by using the graph? (1) If 10 gallons of gas was purchased, \$35 was paid. (2) For every gallon of gas purchased, \$3.75 was paid. (3) For every 2 gallons of gas purchased, \$5.00 was paid. (4) If zero gallons of gas were purchased, zero miles were driven. Algebra I (Common Core) Jan. 16 [2]

3 3 For a recently released movie, the function y (0.61) x models the revenue earned, y, in millions of dollars each week, x, for several weeks after its release. Use this space for computations. Based on the equation, how much more money, in millions of dollars, was earned in revenue for week 3 than for week 5? (1) (3) (2) (4) Given the following expressions: 5 3 I. III. 8 5 II IV. ( 5) ( 5) 3 49 ( ) Which expression(s) result in an irrational number? (1) II, only (3) I, III, IV (2) III, only (4) II, III, IV 5 Which inequality is represented by the graph below? y x (1) y 2x 3 (3) y 3x 2 (2) y 2x 3 (4) y 3x 2 Algebra I (Common Core) Jan. 16 [3] [OVER]

4 6 Michael borrows money from his uncle, who is charging him simple interest using the formula I Prt. To figure out what the interest rate, r, is, Michael rearranges the formula to find r. His new formula is r equals Use this space for computations. (1) I P t (3) (2) P I t (4) I Pt Pt I 7 Which equation is equivalent to y 34 x(x 12)? (1) y (x 17)(x 2) (3) y (x 6) 2 2 (2) y (x 17)(x 2) (4) y (x 6) The equation A 1300(1.02) 7 is being used to calculate the amount of money in a savings account. What does 1.02 represent in this equation? (1) 0.02% decay (3) 2% decay (2) 0.02% growth (4) 2% growth 9 The zeros of the function f(x) 2x 2 4x 6 are (1) 3 and 1 (3) 3 and 1 (2) 3 and 1 (4) 3 and 1 10 When (2x 3) 2 is subtracted from 5x 2, the result is (1) x 2 12x 9 (3) x 2 12x 9 (2) x 2 12x 9 (4) x 2 12x 9 Algebra I (Common Core) Jan. 16 [4]

5 11 Joe has a rectangular patio that measures 10 feet by 12 feet. He wants to increase the area by 50% and plans to increase each dimension by equal lengths, x. Which equation could be used to determine x? Use this space for computations. (1) (10 x)(12 x) 120 (3) (15 x)(18 x) 180 (2) (10 x)(12 x) 180 (4) (15)(18) 120 x 2 12 When factored completely, x 3 13x 2 30x is (1) x(x 3)(x 10) (3) x(x 2)(x 15) (2) x(x 3)(x 10) (4) x(x 2)(x 15) 13 The table below shows the cost of mailing a postcard in different years. During which time interval did the cost increase at the greatest average rate? Year Cost ( ) (1) (3) (2) (4) When solving the equation x 2 8x 7 0 by completing the square, which equation is a step in the process? (1) (x 4) 2 9 (3) (x 8) 2 9 (2) (x 4) 2 23 (4) (x 8) A construction company uses the function f(p), where p is the number of people working on a project, to model the amount of money it spends to complete a project. A reasonable domain for this function would be (1) positive integers (2) positive real numbers (3) both positive and negative integers (4) both positive and negative real numbers Algebra I (Common Core) Jan. 16 [5] [OVER]

6 16 Which function is shown in the table below? Use this space for computations (1) f(x) 3x (3) f(x) x 3 (2) f(x) x 3 (4) f(x) 3 x 1 17 Given the functions h(x) x 3 and j(x) x, which value of x 2 makes h(x) j(x)? (1) 2 (3) 3 (2) 2 (4) 6 18 Which recursively defined function represents the sequence 3, 7, 15, 31,? (1) f(1) 3, f(n 1) 2 f(n) 3 (2) f(1) 3, f(n 1) 2 f(n) 1 (3) f(1) 3, f(n 1) 2f(n) 1 (4) f(1) 3, f(n 1) 3f(n) 2 19 The range of the function defined as y 5 x is (1) y 0 (3) y 0 (2) y 0 (4) y 0 Algebra I (Common Core) Jan. 16 [6]

7 20 The graph of y f(x) is shown below. Use this space for computations. y x What is the graph of y f(x 1) 2? y y x x (1) (3) y y x x (2) (4) Algebra I (Common Core) Jan. 16 [7] [OVER]

8 21 Which pair of equations could not be used to solve the following equations for x and y? 4x 2y 22 2x 2y 8 Use this space for computations. (1) 4x 2y 22 (3) 12x 6y 66 2x 2y 8 6x 6y 24 (2) 4x 2y 22 (4) 8x 4y 44 4x 4y 16 8x 8y 8 22 The graph representing a function is shown below. y x Which function has a minimum that is less than the one shown in the graph? (1) y x 2 6x 7 (3) y x 2 2x 10 (2) y x 3 6 (4) y x 8 2 Algebra I (Common Core) Jan. 16 [8]

9 23 Grisham is considering the three situations below. Use this space for computations. I. For the first 28 days, a sunflower grows at a rate of 3.5 cm per day. II. The value of a car depreciates at a rate of 15% per year after it is purchased. III. The amount of bacteria in a culture triples every two days during an experiment. Which of the statements describes a situation with an equal difference over an equal interval? (1) I, only (3) I and III (2) II, only (4) II and III 24 After performing analyses on a set of data, Jackie examined the scatter plot of the residual values for each analysis. Which scatter plot indicates the best linear fit for the data? y y x x (1) (3) y y x x (2) (4) Algebra I (Common Core) Jan. 16 [9] [OVER]

10 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. Utilize the information provided for each question to determine your answer. Note that diagrams are not necessarily drawn to scale. 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] 25 The function, t(x), is shown in the table below Determine whether t(x) is linear or exponential. Explain your answer. Algebra I (Common Core) Jan. 16 [10]

11 26 Marcel claims that the graph below represents a function. 4 y x State whether Marcel is correct. Justify your answer. Algebra I (Common Core) Jan. 16 [11] [OVER]

12 27 Solve the equation for y. (y 3) 2 4y 12 Algebra I (Common Core) Jan. 16 [12]

13 28 The graph below shows the variation in the average temperature of Earth s surface from , according to one source Year During which years did the temperature variation change the most per unit time? Explain how you determined your answer. Algebra I (Common Core) Jan. 16 [13] [OVER]

14 29 The cost of belonging to a gym can be modeled by C(m) 50m 79.50, where C(m) is the total cost for m months of membership. State the meaning of the slope and y-intercept of this function with respect to the costs associated with the gym membership. Algebra I (Common Core) Jan. 16 [14]

15 30 A statistics class surveyed some students during one lunch period to obtain opinions about television programming preferences. The results of the survey are summarized in the table below. Programming Preferences Comedy Drama Male Female Based on the sample, predict how many of the school s 351 males would prefer comedy. Justify your answer. Algebra I (Common Core) Jan. 16 [15] [OVER]

16 31 Given that a b, solve for x in terms of a and b: b(x 3) ax 7b Algebra I (Common Core) Jan. 16 [16]

17 32 Jacob and Jessica are studying the spread of dandelions. Jacob discovers that the growth over t weeks can be defined by the function f(t) (8) 2 t. Jessica finds that the growth function over t weeks is g(t) 2 t 3. Calculate the number of dandelions that Jacob and Jessica will each have after 5 weeks. Based on the growth from both functions, explain the relationship between f(t) and g(t). Algebra I (Common Core) Jan. 16 [17] [OVER]

19 34 Fred s teacher gave the class the quadratic function f(x) 4x 2 16x 9. a) State two different methods Fred could use to solve the equation f(x) 0. b) Using one of the methods stated in part a, solve f(x) 0 for x, to the nearest tenth. Algebra I (Common Core) Jan. 16 [19] [OVER]

20 35 Erica, the manager at Stellarbeans, collected data on the daily high temperature and revenue from coffee sales. Data from nine days this past fall are shown in the table below. Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 Day 9 High Temperature, t Coffee Sales, f(t) \$2900 \$3080 \$2500 \$2380 \$2200 \$2700 \$3000 \$3620 \$3720 State the linear regression function, f(t), that estimates the day s coffee sales with a high temperature of t. Round all values to the nearest integer. State the correlation coefficient, r, of the data to the nearest hundredth. Does r indicate a strong linear relationship between the variables? Explain your reasoning. Algebra I (Common Core) Jan. 16 [20]

21 36 A contractor has 48 meters of fencing that he is going to use as the perimeter of a rectangular garden. The length of one side of the garden is represented by x, and the area of the garden is 108 square meters. Determine, algebraically, the dimensions of the garden in meters. Algebra I (Common Core) Jan. 16 [21] [OVER]

23 y x Algebra I (Common Core) Jan. 16 [23]

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

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

27 High School Math Reference Sheet Tear Here Tear Here 1 inch 2.54 centimeters 1 kilometer 0.62 mile 1 cup 8 fluid ounces 1 meter inches 1 pound 16 ounces 1 pint 2 cups 1 mile 5280 feet 1 pound kilogram 1 quart 2 pints 1 mile 1760 yards 1 kilogram 2.2 pounds 1 gallon 4 quarts 1 mile kilometers 1 ton 2000 pounds 1 gallon liters 1 liter gallon 1 liter 1000 cubic centimeters 1 Triangle A bh 2 Parallelogram A bh Circle A πr 2 Circle General Prisms Cylinder C πd or C 2πr V Bh V πr 2 h 4 Sphere V πr Cone V πr 2 h 3 1 Pyramid V Bh 3 Pythagorean Theorem Quadratic Formula Arithmetic Sequence Geometric Sequence Geometric Series a 2 b 2 c 2 x b 4ac 2a b 2 a n a 1 (n 1)d a n a 1 r n 1 n a a r 1 1 S n where r 1 1 r 180 Radians 1 radian degrees π π Degrees 1 degree radians 180 Exponential Growth/Decay A A 0 e k(t t 0) B 0 Algebra I (Common Core) Jan. 16 [27]

28 ALGEBRA I (COMMON CORE) Tear Here Tear Here Printed on Recycled Paper ALGEBRA I (COMMON CORE)

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