2.2 Review Worksheet (continued)
12. The manager of a band has kept track of the price of tickets and the attendance at the band’s recent concerts. Concert Attendance by Ticket Price Price ($) 6 5 8.5 8 105.50 7 7.5 8 Attendance 213 256 155 194 160 267 258 210 235 a. Make a scatter plot of the data using price as the independent variable. b. Find the correlation coefficient and the equation of the line of best fit. Draw the line of best fit on your scatter plot. c. Predict the attendance at a concert where the price of tickets is $9. How accurate do you think your prediction is?
2.2.3 Solving Absolute-Value Equations and Inequalities Solve each compound inequality. Then graph the solution set. 13. 2 x − 3 ≥ 7 OR x + 5 < 2 14. 3 x + 6 ≤ 21 AND 4 x − 2 ≥ − 6
Solve each equation. 15. | − 3 x | = 9
16. | x + 7| = 2
17. |3 x − 9| = 6
18. 5|2 x | − 6 = 24
Solve each inequality. Then graph the solution set. 19. | − 2 x | < 2 20. | x + 5| ≥ 2
21. |8 x | + 56 ≥ 40
22. |7 x + 14| ≥ 35
+ x |8 4| 6
23. | − 0.5 x | > 1
24. 6|2 x + 5| > 66
25. − 8| x + 4| > 48
26.
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