Transform both equations in each system of equations so that each coefficient is an integer.

Transcription

1 Algebra 1 (2nd Semester Exam Review) Name 1. Write each expression in rational exponent form. a. b. 2. Write each expression in radical form. a. b. What is the simplified form of each expression? Transform both equations in each system of equations so that each coefficient is an integer. 18. Solve each system of equations by substitution

2 Write a system of linear equations to represent each problem situation. Define each variable. Then, graph the system of equations and estimate the break-even point. Explain what the break-even point represents with respect to the given problem situation. 21. Eric sells model cars from a booth at a local flea market. He purchases each model car from a distributor for $12, and the flea market charges him a booth fee of $50. Eric sells each model car for $ Ramona sets up a lemonade stand in front of her house. Each cup of lemonade costs Ramona $0.30 to make, and she spends $6 on the advertising signs she puts up around her neighborhood. She sells each cup of lemonade for $1.50. Solve each system of equations using the linear combinations (elimination) method

3 Write a system of equations to represent each problem situation. Solve the system of equations using the linear combinations method. 25. Taylor and Natsumi are making block towers out of large and small blocks. They are stacking the blocks on top of each other in a single column. Taylor uses 4 large blocks and 2 small blocks to make a tower 63.8 inches tall. Natsumi uses 9 large blocks and 4 small blocks to make a tower inches tall. How tall is each large block and each small block? Tell whether the graph of each linear inequality will have a dashed line or a solid line. Explain your reasoning Graph each linear inequality y -x y > x Graph each inequality and determine if the ordered pair is a solution for the problem situation. 32. Marcus has 50 tokens to spend at the school carnival. The Ferris wheel costs 7 tokens and the carousel costs 5 tokens. The inequality represents the possible ways Marcus could use his tokens on the two rides. Is the ordered pair (6, 3) a solution for the problem situation?

4 Write a linear inequality in two variables to represent each problem situation. 33. Tanya is baking zucchini muffins and pumpkin muffins for a school event. She needs at least 500 muffins for the event. 34. Patti makes decorative flower pots. It costs her $20 to purchase the materials for each pot. She wants to charge more than $6 per hour of labor plus her materials cost for each pot. 35. Graph the system of inequalities. y 3x 5 y x Carlos works at a movie theater selling tickets. The theater has 300 seats and charges $7.50 for adults and $5.50 for children. The theater expects to make at least $2000 for each showing. Write a system of inequalities to represent this situation. You do not have to solve. 37. Is the point (-2, -10) a solution to the system of inequalities? Calculate the first and second differences for each table of values. Describe the type of function represented by the table x y First Differences Second Differences x y 12 First Differences Second Differences

5 S 40. Write a quadratic function that represents a parabola that opens downward and has x-intercepts and. 41. What are the x-intercepts of the function? 42. Factor to determine the x-intercepts. 8 6 y What are the coordinates of the vertex of the graph? Is it a maximum or minimum? x Graph the function y = 0.5x 2S State the domain and range. 45. How is the graph of y = 4x 2 5 different from the graph of y = 4x 2? 46. Factor: 47. Determine the vertex it the axis of symmetry is. Determine the axis of symmetry of each parabola. 48. The x-intercepts of a parabola are (3, 0) and (9, 0). 49. Two symmetric points on a parabola are.

6 Identify the form of each quadratic function as either standard form, factored form, or vertex form. Then state all you know about the quadratic function s key characteristics, based only on the given equation of the function Determine the vertex of each quadratic function given in vertex form. 53. Describe the transformation performed on each function g(x) to result in d(x). 54. Describe the transformation performed on each function g(x) to result in m(x). 55. Determine whether each expression is a polynomial. If the expression is not a polynomial, explain why it is not Write each polynomial in standard form. Classify the polynomial by its number of terms and by its degree. 58. Simplify each expression Identify the terms and coefficients in each expression. 64.

7 Determine the product of the polynomials using the Distributive Property Factor each of the following completely. If possible, factor out the greatest common factor first Factor and solve each quadratic equation. Check your answer Determine the zeros of each quadratic function, if possible. Check your answer Determine the root(s) of each quadratic equation. Check your answer(s) Simplify each square root (no decimal answers)

8 Solve each quadratic equation. Approximate the roots to the nearest tenth Determine the unknown value that would make each trinomial a perfect square x + 81 Determine the roots of each quadratic equation by completing the square. Round your answer to the nearest hundredth. Check your answer Determine the approximate zeros or roots of each function or equation using the Quadratic Formula. Round your answers to the nearest hundredth, if necessary Choose the term that best completes each statement. dot plot skewed left box-and-whisker plot five number summary discrete data skewed right histogram 99. A(n) displays the data distribution based on a five number summary A data distribution is if the peak of the data is to the right side of the graph with only a few data points to the left side of the graph A(n) is a graph that shows how discrete data are distributed using a number line For a set of data, the consists of the minimum value, the first quartile, the median, the third quartile, and the maximum value A(n) is a graphical way to display quantitative data using vertical bars A data distribution is if the peak of the data is to the left side of the graph with only a few data points to the right side of the graph.

9 Construct the graphical display for each given data set. Describe the distribution of the data Construct a dot plot to display the number of items purchased by a number of randomly chosen customers at a toy store. The data are 2, 4, 3, 7, 12, 3, 1, 5, 6, 3, 4, 2, 4, 3, 7, 14, 10, 3, 5, and Construct a box-and-whisker plot to display the number of miles from school that a number of randomly chosen students live. The data are 5, 10, 15, 12, 1, 14, 9, 15, 3, 10, 12, 15, 8, 14, 13, and Construct a histogram to display the scores on a recent English quiz. The data are 18, 45, 20, 32, 9, 35, 49, 28, 25, 19, 5, 30, 22, 24, and 14. Use as the first interval. Analyze the given dot plot which displays the number of home runs by each of the girls on the softball team this season. Use the dot plot to answer each question. Softball Team Home Runs 108. Describe the distribution of the data in the dot plot and explain what it means in terms of the problem situation How many players are on the softball team? 110. How many players hit more than 2 home runs? 111. How many players hit at least 1 home run?

10 Analyze the given box-and-whisker plot which displays the heights of 40 randomly chosen adults. Use the box-and-whisker plot to answer each question. Heights of 40 Randomly Chosen Adults 112. What is the height range of the middle 50 percent of the surveyed adults? 113. How many of the surveyed adults are exactly 68 inches tall? 114. What percent of the surveyed adults are 68 inches tall or shorter? Analyze the given histogram which displays the ACT composite score of several randomly chosen students. Use the histogram to answer each question. ACT Composite Scores 115. How many students are represented by the histogram? 116. How many of the students had an ACT composite score of at least 20? The relative frequency conditional distribution shows the sports that female and male students choose to participate in. Use the relative frequency conditional distribution to answer each question What percent of male students participate in basketball? 118. Which sport is the most popular among female students? 119. Which sport is the least popular among male students? 120. What percent of female students participate in track & field?

11 Answer Section 1. a. b. 2. a. b

12 20. The solution is. The system is consistent. The solution is. The system is consistent. 21. Eric s income can be modeled by the equation, where y represents the income (in dollars) and x represents the number of model cars he sells. Eric s expenses can be modeled by the equation, where y represents the expenses (in dollars) and x represents the number of model cars he purchases from the distributor. The break-even point is between 6 and 7 model cars. Eric must sell more than 6 model cars to make a profit. 22. Ramona s income can be modeled by the equation, where y represents the income (in dollars) and x represents the number of cups of lemonade she sells. Ramona s expenses can be modeled by the equation, where y represents the expenses (in dollars) and x represents the number of cups of lemonade she makes.

13 23. The break-even point is 5 cups of lemonade. Ramona must sell more than 5 cups of lemonade to make a profit. 24. The solution is. The solution is.

14 25. Let x represent the height (in inches) of each large block. Let y represent the height (in inches) of each small block. The solution is. Each large block is 12.2 inches tall and each small block is 7.5 inches tall. 26. The line will be solid because the symbol is. 27. The line will be dashed because the symbol is <

15 No. The ordered pair (6, 3) is not a solution to the inequality. It is not in the shaded half-plane Answers will vary. (2, 3) and (6, 0)

16 36. x = the number of adults y = the number of children Yes. The point is a solution to the system of inequalities. x y First Differences Second Differences The function represented by the table is a linear function. x y 12 First Differences Second Differences 3 6

17 The function represented by the table is a quadratic function. 40. Answers will vary but functions should be in the form: 41. The x-intercepts are (2, 0) and (8, 0). 42. x-intercepts: factored form: 43. (0, 1); maximum 44. B 45. D The axis of symmetry is. The x-coordinate of the vertex is. The y-coordinate when is: The vertex is. 48. The axis of symmetry is x = The axis of symmetry is. 50. The function is in factored form. The parabola opens down and the x-intercepts are (8, 0) and (4, 0). 51. The function is in standard form. The parabola opens up, the y-intercept is and the vertex is. 52. The function is in vertex form. The parabola opens up and the vertex is (3, 12). 53. The vertex is (2, 6). 54. The graph of g(x) is translated down 5 units. 55. The graph of g(x) is translated left 4 units. 56. The expression is a polynomial. 57. The expression is not a polynomial, because the term has an exponent that is not a whole number. 58. The polynomial is a trinomial with a degree of 5.

18 The terms are and. The coefficients are, 1, and x x 18

19 70. Factor using a multiplication table. w w 5 5w 71. Factor using a multiplication table. m 2 m 2m 10 10m x 2 x 2x 73. The factors of the constant term,, are: 74. x 2 x 2x 2 2x x

20 x Factor using a multiplication table. x x 3 3x The roots are 0 and. The roots are and 1.

21 The roots are and. 82. The roots are 4 and. 83. The zeros are 12 and. The zeros are and. Check:

22 84. The roots are and The roots are and The root is

23 The roots are approximately 6.3 and. 92. The roots are approximately 0.3 and 9.7. The roots are and

24 The roots are approximately 1.16 and. The roots are approximately and. 97.

25 box-and-whisker plot 100. skewed left 101. dot plot 102. five number summary 103. histogram 104. skewed right 105. The data are skewed right.

26 106. The data are skewed left The data are symmetric The data are skewed right, because a majority of the data values are on the left of the plot and only a few of the data values are on the right of the plot. This means that a majority of the players on the softball team hit a small number of home runs, while only a few players on the team hit a large number of home runs There are 14 players on the softball team Five players hit more than 2 home runs Ten players hit at least 1 home run The middle 50 percent of the surveyed adults are at least 65 inches and at most 72 inches tall It is not possible to determine the number of surveyed adults who are exactly 68 inches tall Fifty percent of the surveyed adults are 68 inches tall or shorter There are a total of 31 students represented by the histogram Twenty students had an ACT composite score of at least Of the male students, 24.7% participate in basketball Among female students, swimming is the most popular sport with 36.5% of female students participating Among male students, soccer is the least popular sport with 19.6% of male students participating Of the female students, 25.9% participate in track & field.