Basic Mathematics for College Students

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    90. 
        
    
    
    
    


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APPLICATIONS

97. THE STOCK MARKET For the week of January
    5–9, 2009, the Dow Jones Industrial Average
    performance was as follows, Monday: , Tuesday:
    , Wednesday: , Thursday: , Friday:.
    Round each number to the nearest ten and estimate
    the net gain or loss of points in the Dow for that
    week. (Source: finance.yahoo.com)


98. STOCK MARKET RECORDS Refer to the tables
    below. Round each of the record Dow Jones point
    gains and losses to the nearest hundred and then
    add all ten of them. There is an interesting result.
    What is it?

 61  227  27  129

 74

(6)^2  1

(2^2 3)

4(5) 2

3  32

 2  06  420  3  406  70

11 ( 2  2 3)

015 ( 3  4 8) 0

2 3[5(110)]

0 2( 8 2) 100

201  80  0  80 2(5)6( 0  30 )^2

2 a

 12

3

3 a b3(5)

 18

3

b2(2)

 62  62  92  92 penalized very heavily. Find the test score of a

student who gets 12 correct and 3 wrong and leaves

5 questions blank.

190 Chapter 2 The Integers

Rank Date Gain

1 10/13/2008

2 10/28/2008

3 11/13/2008

4 11/21/2008

5 9/30/2008  485

 494

 553

 889

 936

5 Greatest Dow Jones Daily Point Gains

Rank Date Loss

1 9/29/2008

2 10/15/2008

3 12/1/2008

4 10/9/2008

5 10/22/2008  514

 679

 680

 733

 778

5 Greatest Dow Jones Daily Point Losses

(Source: Dow Jones Indexes)

99. TESTING In an effort to discourage her students
    from guessing on multiple-choice tests, a professor
    uses the grading scale shown in the table in the next
    column. If unsure of an answer, a student does best
    to skip the question, because incorrect responses are

Response Value

Correct

Incorrect

Left blank  1

 4

 3

AB C D

1 12 6

2 1545

3 64  2 8

 4

 5  2

2008 2009

High school enrollment enrollment Drop

Mesa 2,683 2,573

Red Mountain 2,754 2,662

Skyline 1,948 1,875

Westwood 2,257 2,192

(Source: azcentral.com)

100. SPREADSHEETS The table shows the data from
     a chemistry experiment in spreadsheet form. To
     obtain a result, the chemist needs to add the values
     in row 1, double that sum, and then divide that
     number by the smallest value in column C. What is
     the final result of these calculations?


101. BUSINESS TAKEOVERS Six investors are taking
     over a poorly managed company, but first they must
     repay the debt that the company built up over the past
     four quarters. (See the graph below.) If the investors
     plan equal ownership, how much of the company’s
     total debt is each investor responsible for?

–12

Company debt (millions of dollars)

1st qtr

–15

2nd qtr

–5

3rd qtr

–16

4th qtr

102. DECLINING ENROLLMENT Find the drop in
     enrollment for each Mesa, Arizona, high school
     shown in the table below. Express each drop as a
     negative number. Then find the mean (average) drop
     in enrollment for these four schools.