Page 59 - Basic College Mathematics with Early Integers

36 C HAPTE R 1 I THE WHOLE NUMBERS

69. The population of Oklahoma is projected to grow 70. In 1996, the centennial of the Boston Marathon, the
from 3648 thousand in 2009 to 4100 thousand in official number of participants was 38,708. In 2009,
2025.What is Oklahoma’s projected population there were 12,322 fewer participants. How many
increase over this time? official participants were there for the 2009 Boston
Marathon?

Boston

The decibel (dB) is a unit of measurement for sound. Every increase of 10 dB is a tenfold increase in sound intensity.
The bar graph below shows the decibel levels for some common sounds. Use this graph for Exercises 71 through 74.
Decibel Levels for Common Sounds
71. What is the dB rating for live rock music?
120
72. Which is the quietest of all the sounds shown in the 100 100
graph? 80 88
Decibels (dB) 60
73. How much louder is the sound of snoring than normal 70
conversation?

74. What is the difference in sound intensity between live 40 30
rock music and loud television? 20 10
0
Leaves Normal Live Rock Snoring Loud
Rustling Conversation Music Television
Sound Examples

75. The 111th Congress has 539 senators and 76. In the United States, there were 23,729 tornadoes
representatives. Of these, 219 were registered from 1990 through 2008. In all, 13,205 of these
Boy Scouts at some time in their lives. How many tornadoes occurred from 1990 through 2000. How
members of the 111th Congress were never many tornadoes occurred during the period after
Boy Scouts? (Source: Boy Scouts of America, 2000? (Source: Storm Prediction Center, National
U.S. Senate) Weather Service)

77. Until recently, the world’s largest permanent maze 78. There were only 25 California condors in the entire
was located in Ruurlo, Netherlands.This maze of world in 1987.To date, the number has increased to
beech hedges covers 94,080 square feet.A new hedge an estimated 127 living in the wild. How much of an
maze using hibiscus bushes at the Dole Plantation in increase is this? (Source: California Department of
Wahiawa, Hawaii, covers 100,000 square feet. How Fish and Game)
much larger is the Dole Plantation maze than the
Ruurlo maze? (Source:The Guinness Book of
Records)

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