CHAPTER 2 Review Exercises 127
REVIEW EXERCISES
CHAPTER 2
2.1 Solve each equation.
1. 2.
3. 4.
Solve each equation. Then tell whether the equation is conditional, an identity, or a
contradiction.
5.6.7.2.2 Solve each formula for the specified variable.
- for L 9. for b
Solve each equation for x.
- Give the steps you would use to solve
2.2, 2.3 Solve each problem.
13.A rectangular solid has a volume of Its length is 6 ft and its width is 5 ft. Find its
height.
14.The number of students attending college in the United States in 2000 was about
15.3 million. By 2007, the number had increased to about 18.2 million. To the nearest
tenth, what was the percent increase? (Source:National Center for Education Statistics.)
15.Find the simple-interest rate that Halina Adamska is earning if the principal of $30,000
earns $7800 interest in 4 yr.
16.If the Fahrenheit temperature is 77°, what is the corresponding Celsius temperature?For 2008, total U.S. government spending
was about $2980billion (or $2.98trillion).
The circle graph shows how the spending
was divided.
17.About how much was spent on Social
Security?
18.About how much did the U.S. govern-
ment spend on education and social
services in 2008?180 ft^3.- 2 x+ 5 =7.
P=
3
4
M=- x- 121
4
1 x+ 3 y 2a=1
2
V=LWH h 1 b+B 2- 2 x+ 61 x- 12 + 3 x- 14 - x 2 =- 1 x+ 52 - 5
8 x- 4 x- 1 x- 72 + 9 x+ 6 = 12 x- 77 x- 312 x- 52 + 5 + 3 x= 4 x+ 20512 x- 32 = 61 x- 12 + 4 x2 x+ 1
3-
x- 1
4= 0
-
3
4
- 18 + 3 x 2 + 5 = 2 x+ 6 x=- 12
Medicare/health
programs
22.5%National
defense
20.7%Social
Security
20.7%Income
security
14.5%
Other
18.5%
Education &
social services
3.1%
Source: U.S. Office of Management and Budget.2008 U.S. Government Spending