AnswersAdvanced Algebra Concepts and Connections_TC_Online LearningUnit Test

Composition of Functions Answers

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1
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If f(x) = x2 + 1 and g(x) = x – 4, which value is equivalent to ?

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A
37
B
97
C
126
D
606
2
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Which description best explains the domain of ?

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A
the elements in the domain of f(x) for which g(f(x)) is defined
B
the elements in the domain of f(x) for which g(f(x)) is not zero
C
the elements in the domain of g(x) for which g(f(x)) is defined
D
the elements in the domain of g(x) for which g(f(x)) is not zero
3

If and h(x) = 4 – x, what is the value of ?

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Option
Option A
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Option
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Option
Option C
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Option
Option D
4

If h(x) = x – 7 and g(x) = x2, which expression is equivalent to ?

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A
(5 – 7)2
B
(5)2 – 7
C
(5)2(5 – 7)
D
(5 – 7)x2
5

If s(x) = x – 7 and t(x) = 4x2 – x + 3, which expression is equivalent to ?

Question illustration
A
4(x – 7)2 – x – 7 + 3
B
4(x – 7)2 – (x – 7) + 3
C
(4x2 – x + 3) – 7
D
(4x2 – x + 3)(x – 7)
6

The domain of f(x) is the set of all real values except 7, and the domain of g(x) is the set of all real values except –3. Which of the following describes the domain of ?

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A
all real values except and the x for which
Option A
B
all real values except and the x for which
Option B
C
all real values except and the x for which
Option C
D
all real values except and the x for which
Option D
7

If h(x) = 5 + x and , which expression is equivalent to ?

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Option A
B
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D
5 + (5 + x)
8

If h(x) = 6 – x, what is the value of ?

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A
–4
B
–2
C
10
D
16
9

If and n(x) = x – 3, which function has the same domain as ?

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Option
Option A
B
Option
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Option
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D
Option
Option D
10

A homeowner has an octagonal gazebo inside a circular area. Each vertex of the gazebo lies on the circumference of the circular area. The area that is inside the circle, but outside the gazebo, requires mulch. This area is represented by the function m(x), where x is the length of the radius of the circle in feet. The homeowner estimates that he will pay $1.50 per square foot of mulch. This cost is represented by the function g(m), where m is the area requiring mulch. Which expression represents the cost of the mulch based on the radius of the circle?

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Option A
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D
Option
Option D
11

If p(x) = 2x2 – 4x and q(x) = x – 3, what is ?

Question illustration
A
2x2 – 4x + 12
B
2x2 – 16x + 18
C
2x2 – 16x + 30
D
2x2 – 16x + 15
12

If and g(x) = 5x – 4, what is the domain of ?

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Option A
B
Option
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Option
Option C
D
Option
Option D
13

Fifteen percent of an employee’s taxable income is collected each paycheck. Before taxes are removed from each paycheck, $350 of tax-exempt expenses is taken out. If the variable x represents the employee’s pay before tax-exempt expenses and taxes are removed, which expression represents the employee’s take-home pay after these deductions?

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Option A
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Option
Option D

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