109.The largest change in temperature ever
recorded within a 24-hr period occurred
in Montana, on January 23–24, 1916.
The temperature fell 100°F from a
starting temperature of 44°F. What was
the low temperature during this period?
(Source: Guinness World Records.)
110.The lowest temperature ever recorded in
Tennessee was 32°F. The highest tem-
perature ever recorded there was 145°F
more than the lowest. What was this
highest temperature? (Source:National
Climatic Data Center.)
-
46 CHAPTER 1 The Real Number System
44 °
?
0 °
0 °
145 °
?
–32°
111.The lowest temperature ever recorded in Illinois was 36°F on January 5, 1999. The
lowest temperature ever recorded in Utah was on February 1, 1985, and was 33°F lower
than Illinois’s record low. What is the record low temperature for Utah? (Source:National
Climatic Data Center.)
112.The top of Mt. Whitney, visible from Death Valley, has an altitude of 14,494 ft above sea
level. The bottom of Death Valley is 282 ft below sea level. Using 0 as sea level, find the
difference between these two elevations. (Source: World Almanac and Book of Facts.)
-
113.The surface, or rim, of a canyon is at
altitude 0. On a hike down into the
canyon, a party of hikers stops for a rest
at 130 m below the surface. The hikers
then descend another 54 m. Write the
new altitude as a signed number.
114.A pilot announces to the passengers
that the current altitude of their plane is
34,000 ft. Because of turbulence, the
pilot is forced to descend 2100 ft. Write
the new altitude as a signed number.
115.In 2005, Americans saved of their after-
tax incomes. In May 2009, they saved 6.9%.
(Source:U.S. Bureau of Economic Analysis.)
(a)Find the difference between the 2009 and
the 2005 amounts.
(b)How could Americans have a negative
personal savings rate in 2005?
116.In 2000, the U.S. federal budget had a surplus
of $236 billion. In 2008, the federal budget had
a deficit of $455 billion. Find the difference be-
tween the 2008 and the 2000 amounts. (Source:
U.S. Treasury Department.)
- 0.5%
130 m
54 m
2100 ft
34,000 ft
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