1. In the expression, 12 ·  z, the letter z is called the _____ because it stands for an unknown number. A. product B. variable C. algebraic expression D. numerical expression Hint 2. Write an equation for the sentence ''the product of 6 and x is equal to the sum of c and d.'' A. 6x = c + d B. 6x + c + d C. 6x = d D. 6 + x = c + d Hint 3. The cost of a shirt is \$11.99. When Ian pays for the shirt plus tax with a 20-dollar bill, he receives \$7.30 in change. Which equation represents this situation if t is the tax on the shirt? A. 11.99 + t = 20.00 - 7.30 B. 20.00 - 11.99t = 7.30 C. t - 11.99 = 20.00 - 7.30 D. 11.99t = 20.00 - 7.30 Hint 4. Find the value of the expression 15 + 4 · 3. A. 27 B. 57 C. 180 D. 22 Hint 5. Evaluate the expression 15 - (x ÷ y) + 4 if x = 48 and y = 6. A. 19 B. 27 C. 3 D. 11 Hint 6. Evaluate the expression 7 · f + 6 ÷ d if f = 12 and d = 3. A. 86 B. 30 C. 84 D. 42 Hint 7. A long-distance telephone service charges \$5.00 per month for the service and then either \$0.10 per minute or \$0.05 per minute depending upon the time of day. Suppose during one month, you make one 15-minute and one 40-minute call at the \$0.10 per minute rate and one 65-minute and one 90-minute call at the \$0.05 rate. What will be the total charge for that month? A. \$18.25 B. \$15.50 C. \$13.25 D. \$26 Hint 8. Which mathematical statement is not an example of the Distributive Property? A. 3(2 + 8) = 3 · 2 + 3 · 8 B. xy + 2x = x(y +2) C. 3 · (4 · 9) = (9 · 4) · 3 D. 6(10 - 3) = (6 · 10) - (6 · 3) Hint 9. Simplify the expression 9a + 5a. A. 45a B. 14a C. 14 · 2a D. aa Hint 10. Simplify the expression 3(5x + 9 - 4x). A. 3x + 27 B. 13x C. 27x + 27 D. 30x Hint 11. The graph below can best be described as a _____. A. stem-and-leaf plot B. histogram C. box graph D. line graph Hint 12. The graph below can best be described as a _____. A. histogram B. stem-and-leaf plot C. line graph D. box graph Hint 13. Which value occurred most often? A. 89 B. 75 C. 95 D. 98 Hint 14. What was the highest value? A. 98 B. 62 C. You can't tell from the graph. D. 95 Hint 15. Name the property of numbers shown by the statement:23 · 0 = 0 · 23 = 0. A. Multiplicative Property of Zero B. Substitution Property C. Multiplicative Identity D. Additive Identity Hint 16. Name the property shown by the statement (4 · 3) · 2 = 4 · (3 · 2). A. Commutative Property of Addition B. Associative Property of Multiplication C. Associative Property of Addition D. Closure Property of Whole Numbers Hint 17. Use the distributive property to rewrite the expression 7c + 21d + 14e. A. 7(c + 21d + 14e) B. 7(c + 3d + 2e) C. 7c + 14(2d + 3) D. 5(c + 7d + 3e) Hint 18. Which value for j solves the equation 3j – 2 = 4? A. j = 2 B. j = 1 C. j = 4 D. j = 3 Hint 19. According to the graph, do you think Arturo will be making at least \$80.00 per week by the time he is 16 if he continues his lawn mowing business? Explain. A. Yes; if the graph keeps increasing at the same rate, it will bypass \$80.00 per week by the time he is 16 years old. B. No; the graph never goes higher than \$75.00 per week. C. No; the amount of money Arturo makes per week is decreasing. D. Yes; Arturo has always made at least \$80.00 per week mowing lawns. Hint 20. Use the frequency table to find the correct histogram for the data. A. B. C. D. Hint