CHAPTERS 1–8 Cumulative Review Exercises 551Simplify each expression.Solve each equation or inequality.7.Trevor Brazile won the ProRodeo All-Around
Championship in both 2006 and 2007. He set a
new record for winnings in 2006 and then
broke his own record by $95,191 in 2007. He
won a total of $755,039 in these two years.
How much did he win each year? (Source: The
World Almanac and Book of Facts.)Graph.
- 11.The graph shows a line that models the number
of cell phone subscribers in millions in the
United States from 2002 to 2008.
(a)Use the ordered pairs shown on the graph to
find the slope of the line to the nearest tenth.
Interpret the slope.
(b)Use the slope from part (a) and the ordered
pair to find the equation of the
line that models the data, where
represents 2002.
(c)Use the equation from part (b) to estimate
the number of cell phone subscribers in
- 11.The graph shows a line that models the number
- Round to the nearest tenth.
Solve each system of equations.
12.
3 x+ 2 y=- 54 x- y= 19x= 01 0, 140.8 2- 4 x+ 5 y=- 20 x= 2 2 x- 5 y 710
- 5 z+ 3 - 472 z+ 9 +z
3
4
51 k- 42 - k=k- 11 x... 12|- 6 |-|- 3 |316 + 72 + 3
2142 - 1316 + 72 + 6 # 4 - 32
CUMULATIVE REVIEW EXERCISES
CHAPTERS 1– 8
Cell Phone Subscribers0100200300Subscribers (in millions) 0
Year(^246)
y
x
Source: CITA—The Wireless Association.
(0, 140.8)
(6, 262.7)
13.
3 y= 6 x- 18
2 x-y= 6
14.Des Moines and Chicago are 345 mi apart.
Two cars start from these cities, traveling
toward each other. They meet after 3 hr. The
car from Chicago has an average rate 7 mph
faster than the other car. Find the average rate
of each car. (Source: State Farm Road Atlas.)
Simplify and write each expression without negative exponents. Assume that variables repre-
sent positive real numbers.
- 16.a
32 y-^2
2 -^1 y^3b- 3
13 x^6212 x^2 y 22
Des Moines345 mi
Chicago