Page 557 - Algebra 1

23. Music Amber normally listens to 1 new CD and 7 old CDs every day. She starts (81) to listen to 2 more new CDs each day and 1 less old CD each day. How many days
will it take her to listen to more new CDs than old CDs?
*24. Geometry The length of a rectangle is greater than its width. The length is 4x + 7 (81) and the width is 5x - 2. What does the value of x have to be for this statement to
be true?
*25. Error Analysis Two students are told to write an inequality that is a contradiction.
(81) Which student is correct? Explain the error.
*26. Solve the inequality. Justify your steps. (82) -17 > -2x - 7 OR 27 > 3(x + 6)
*27. Multiple Choice What is the solution to 32 < 7x + 11 < 39? (82) A 21>x>28 B 3<x>4
C3<x<4 D3>x>4
*28. Cholesterol Levels An average level of HDL, a type of good cholesterol, for a (82) person is usually no more than 60, and an unhealthy level is lower than 40.
A doctor sees 4 patients and tests their HDL levels. The first 3 levels are 45, 52, and 60. What can the fourth patient’s HDL level be if the average of all four patients’ levels fall in the average, but not unhealthy, range of levels?
*29. Formulate Half of Mr. Rubenstein’s math class studied for the test and the other (82) half did not. Everyone who studied for the test got a score no lower than 90;
everyone who did not study got a score lower than 70. Write the scores of the class as an inequality.
*30. Estimate Felipe wants to earn a grade between 90 and 100 in math. There are
(82) 4 major tests over the year, which are averaged to determine his final grade. Felipe
scored 94, 88, and 91 on the first 3 tests. What must he score on the last test for his average grade to fall between 90 and 100? Round his scores to solve.
Student A
-2 + x > x + 3
Student B
2x + 24 < 3x + 24
542 Saxon Algebra 1