Precal functions and their graphs c1 test
Take this test as you would take a test in class. After you are finished, check your work against the answers in the back of the book. 1. Find the equations of the lines that pass through the point (0, 4) and are (a) parallel to and (b) perpendicular to the line 3x + 2y = 3. -4 2. Find the slope-intercept form of the equation of the line that passes through the points (2, - 1) and (-3, 4). 3. Does the graph at the right represent y as a function of x? Explain. Figure for 3 4. Evaluate f(x) = |x + 2| - 15 at each value of the independent variable and simplify. (a) f(-8) (b) /(14) (c) fur - 6) 5. Find the domain of f(x) = 10 - 3 - x. 6. An electronics company produces a car stereo for which the variable cost is $5.60 and the fixed costs are $24,000. The product sells for $99.50. Write the total cost C as a function of the number of units produced and sold, x. Write the profit P as a function of the number of units produced and sold, x. In Exercises 7 and 8, determine algebraically whether the function is even, odd, or neither. 7. f(x) = 2x3 - 3.x 8. /(x) = 3x + 5.x In Exercises 9 and 10, determine the open intervals on which the function is increase ing, decreasing, or constant. 9. h(x) = 4x4 - 2x2 10. g(t) = | + 21 - |: - 21 In Exercises 11 and 12, use a graphing utility to graph the functions and to approximate (to two decimal places) any relative minimum or relative maximum values of the function. 11. /() = =>' - 5x2 + 12 12. /(x) = > - + 2 In Exercises 13-15, (a) identify the parent function f, (b) describe the sequence of transformations from f to g, and (c) sketch the graph of g. 13. g(x) = -2(x - 5)3 + 3 14. g(x) = V-x - 7 15. g(x) = 41-x - 7 16. Use the functions f(x) = x and g(x) = 2 - x to find the specified function and its domain. (a) (f - g)(x) In Exercises 17-19, determine whether the function has an inverse function, and if so, find the inverse function. Year, t Subscribers, S 17. /(x) = x3 + 8 18. /(x) = 12 + 6 19. /(x) = 3xVx 9 86.0 8 109.5 20. The table shows the numbers of cellular phone subscribers S (in millions) in the 11 128.4 United States from 1999 through 2004, where r represents the year, with 1 = 9 12 140.8 corresponding to 1999. Use the regression feature of a graphing utility to find a linear 13 158.7 model for the data. Use the model to find the year in which the number of subscribers 14 182.1 exceeded 200 million. (Source: Cellular Telecommunications & Internet Association) Table for 20
