Basic Mathematics for College Students

68. Multiply.[Section 8.2]
    a.
    b.


69. Combine like terms.[Section 8.2]
    a.
    b.
    c.
    d.


70. Check to determine whether is a solution of
    . [Section 8.3]

Solve each equation and check the result.[Section 8.4]

73.

74.

75. OBSERVATION HOURS To pass a teacher
    education course, a student must have 90 hours of
    classroom observation time. If a student has already
    observed for 48 hours, how many 6-hour classroom
    visits must she make to meet the requirement? (Hint:
    Form an equation and solve it to answer the
    question.)[Section 8.5]


76. Identify the base and the exponent of each
    expression.[Section 8.6]
    a. b.


77. Simplify each expression.[Section 8.6]
    a. b.
    c. d.
    e. f.


78. Fill in the blanks.[Section 9.1]
    a. The measure of an angle is less than 90°.
    b. The measure of a angle is 90°.
    c. The measure of an angle is greater than
    90° but less than 180°.
    d. The measure of a straight angle is.

(y^5 )^2 (y^4 )^3 C(5.5)^3 D^12

(r^2 t^4 )(r^3 t^5 ) (2b^3 c^6 )^3

s^4 s^5 s (a^5 )^7

48 3 s^4

x 2  13

3(2p15) 3 p4(11p)

4 x 40  20

x

8

 2  5

5 x 9 x 16

 6

4 x2(3x4)5(2x)

4 mn 12 m 7 n

c^2  4 c^2  2 c^2 c^2

10 x 7 x

8(4x 5 y1)

9(3t10)

79. a. Find the supplement of an angle of 105°.
    [Section 9.1]
    b. Find the complement of an angle of 75°.
    [Section 9.1]


80. Refer to the figure below, where. Find the
    measure of each angle.[Section 9.2]
    a. b.
    c. d.


81. Refer to the figure below, where and
    . Find the measure of each angle.
    [Section 9.3]
    a. b.
    c. d.


82. JAVELIN THROW Refer to the illustration below.
    Determine and .[Section 9.3]

44°

y° x°

x y

75°

2

1

3

C

DE

A B

m(2) m(3)

m(1) m(C)

m(AC)m(BC)

ABDE

(^1) 130°
23
4
l 2
l 1
l 3
m(2) m(4)
m(1) m(3)
l 1 l 2
842 Chapter 9 Cumulative Review