Beginning Algebra, 11th Edition

Name each property illustrated.

Solve each equation, and check the solution.

15.Solve for y.

Solve each inequality. Write the solution set in interval notation, and graph it.

Solve each problem.

18.A 40-cm piece of yarn must be cut into three
pieces. The longest piece is to be three times
as long as the middle-sized piece, and the
shortest piece is to be 5 cm shorter than the
middle-sized piece. Find the length of each
piece.

19.A fully inflated professional basketball has a circumference of
78 cm. What is the radius of a circular cross section through the
center of the ball? (Use 3.14 as the approximation for .) Round
your answer to the nearest hundredth.

20.Two cars are 400 mi apart. Both start at the same time and travel toward one another. They
meet 4 hr later. If the rate of one car is 20 mph faster than the other, what is the rate of
each car?

p

61 r- 12 + 213 r- 52 ...- 4 - 18 ...- 9 z 69

3 x+ 4 y= 24

2 x+ 3

5

=

x- 4

2

2

3

x+

3

4

x=- 17

2 r- 6 = 8 r 4 - 51 s+ 22 = 31 s+ 12 - 1

71 p+q 2 = 7 p+ 7 q 3 + 15 + 22 = 3 + 12 + 52

CHAPTERS 1–2 Cumulative Review Exercises 173

40 cm

Longest

piece

x

Middle-sized

piece

Smallest piece

78 cm