1. The temperature f(x) of water in a lake in degrees Fahrenheit is estimated by the function shown below, where x is the depth in feet of the water. What would be the temperature of water 30 feet below the surface? A. 111°F B. 63°F C. 33°F D. 71.25°F Hint 2. State the slope of the line graphed below. A. B. C. D. Hint 3. State the slope and y-intercept of the graph of -y = -0.9x + 4. A. m = 4, b = -0.9 B. m = -4, b = 0.9 C. m = 0.9, b = -4 D. m = -0.9, b = 4 Hint 4. A best-fit line is drawn on a scatter plot showing the average daily temperature and the number of people at a public swimming pool. The slope of the line would probably be ________ A. positive. B. negative. C. undefined. D. zero. Hint 5. What is the first step in solving the system of equations using the elimination method? A. Add the equations. B. Solve the first equation for x. C. Multiply the second equation by 2. D. Subtract the second equation from the first equation. Hint 6. Solve the system of equations by using substitution. A. (5, 11) B. (4, 9) C. (3, 7) D. (1, 3) Hint 7. Use the substitution method to solve m - n = 7 and 3m + 2n = 6. A. (-3, -10) B. C. (4, -3) D. (-5, 2) Hint 8. Use the elimination method to solve the system of equations. A. B. C. D. Hint 9. Which element is in row 3, column 1? A. 6 B. 4 C. -1 D. 9 Hint 10. Find [6,3,-1]. A. [3 3 -1] B. C. D. Hint 11. Determine which matrix has a determinant. A. B. C. [1 -4 -8] D. Hint 12. Simplify (-3a5b3)4. A. 81a20b12 B. -12a9b7 C. -81a9b12 D. -12a20b12 Hint 13. Write an equation for the hyperbola below. A. B. C. D. Hint 14. Find the vertex of the graph of the function  f(x) =  x2 - 6x + 5. A. (3, -4) B. (-6, 5) C. (-3, 4) D. (3, 4) Hint 15. A scatter plot is __________. A. a line graphed in a portion of Quadrant I of the coordinate plane B. a table of data C. a set of data graphed as ordered pairs in a coordinate plane D. a line graph Hint 16. Which of the following systems of equations is not consistent and independent? A. y + 4x = 10 6y + 24x = 60 B. 2y + 4x = 3 7y + 5x = 18 C. 7y + x = 9 3y + 9x = 4 D. –y – 5x = 1 4y + 3x = 8 Hint 17. Which of the following graphs best represents the function y = –x2 + 7x + 8? A. B. C. D. Hint 18. Solve 0 = x2 + 4x + 5 by graphing. A. 1, –5 B. 2 C. –1, 5 D. no real roots Hint 19. Is the inverse of a quadratic function a square root function? A. No. B. It is a square root function only if the range is restricted to nonnegative numbers. C. It is a square root function only if it is a quadratic function that opens up. D. Yes. Hint 20. What is equidistant to all of the points on a circle? A. center B. diameter C. tangent line D. radius Hint