83 / 84
for
Standardized
Test Practice
9.
Solve the equation.
3
√
2
x
+ 5+ 8 = 11
10.
What is the value of
x
for the equation 4
+
3
√
9
x
+
81
=
10?
A
-
37
B
2
C
15
D
244
11.
Andrew works at a suit store where he earns $360
per forty-hour work week, plus a 10% commission
on sales over $500 each week, which can be
represented by the functions
f
(
x
)
=
0.1
x
and
g
(
x
)
=
x
– 500, where
x
is the amount Andrew makes in
sales in a week. Assuming Andrew made enough to
earn a commission, which composition would give
his commission: (
f
o
g
)(
x
) or (
g
o
f
)(
x
)? Explain your
reasoning.
12.
Which of the following belong to the solution set of
10
-
√
4
x
+
20
>
2?
A
-
3
B
6
C
11
D
16
E
21
13.
If
a
=
10 and
b
=
13, what is the value of
(6
√
a
+
2
√
b
)(6
√
a
-
2
√
b
)?
14.
What is (
f
◦
g
)(
-
2) and (
g
◦
f
)(
-
2) for the functions
f
(
x
)
=
x
2
-
100 and
g
(
x
)
=
x
+
10?
A
-
134;
-
28
B
-
36;
-
86
C
192; 28
D
242; 64
15.
Let
f
(
x
)
=
x
2
-
1. What is the value of
f
[
f
(2)]?
16.
Which of the following functions is graphed below?
C06_106A_139256
−
2
−
3
−
4
−
1
4
3
2
1
1 2 3 4
−
2
−
3
−
4
x
O
y
A
y
=
√
x
-
2
-
3
B
y
=
√
x
+
2
-
3
C
y
=
√
x
-
3
-
2
D
y
=
√
x
+
3
-
2
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