Page 154 - Basic College Mathematics with Early Integers

S E C T I O N 2.3 I ADDING INTEGERS 131

Solve. See Example 18.

81. Suppose a deep-sea diver dives from the surface to 82. Suppose a diver dives from the surface to 248 meters
215 feet below the surface. He then dives down 16 below the surface and then swims up 6 meters, down
more feet. Use positive and negative numbers to 17 meters, down another 24 meters, and then up
represent this situation.Then find the diver’s present 23 meters. Use positive and negative numbers to
depth. represent this situation.Then find the diver’s depth
after these movements.

In golf, it is possible to have positive and negative scores.The following table shows the results of the eighteen-hole Round
3 for Angela Stanford and Michelle Wie at the 2009 SBS Open at Turtle Bay. Use the table to answer Exercises 83 and 84.

Player/Hole 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Stanford 0 0 0 -1 0 0 0 +1 0 +1 0 0 -1 -1 -1 0 0 0
Wie 0 0 0 -1 0 0 0 0 -1 0 +2 0 0 0 0 0 +1 0

(Source: Ladies’ Professional Golf Association)
83. Find the total score for each of the athletes in the 84. In golf, the lower score is the winner. Use the result of
round. Exercise 83 to determine who won Round 3.

The following bar graph shows the yearly net income for Apple, Inc. Net income is one indication of a company’s health.
It measures revenue (money taken in) minus cost (money spent). Use this graph to answer Exercises 85 through 88.
(Source:Apple, Inc.)
Apple, Inc. Net Income
85. What was the net income (in dollars) for Apple, Inc. 4000
3496
in 2007? 3500
3000
Net Income (in millions of dollars) 2000
86. What was the net income (in dollars) for Apple, Inc. 2500
in 2001? 1500 1328

87. Find the total net income for the years 2003 and 2005. 1000
500
69
0
25
88. Find the total net income for all the years shown. 500
2001 2003 2005 2007
Year

89. The temperature at 4 p.m. on February 2 was -10° 90. In some card games, it is possible to have both
Celsius. By 11 p.m. the temperature had risen 12 positive and negative scores.After four rounds of
degrees. Find the temperature at 11 p.m. play, Michelle had scores of 14, -5 , -8 , and 7.What
was her total score for the game?

A small business company reports the following net incomes. Use this table for Exercises 91 and 92.

91. Find the sum of the net incomes for 2007 and 2008. Year Net Income (in Dollars)
2006 $75,083
2007 -$10,412

2008 -$1786
92. Find the net income sum for all four years shown.
2009 $96,398