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Algebra II : Algebra II

Study concepts, example questions & explanations for Algebra II

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10 Diagnostic Tests 630 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #5 : Irrational Numbers

Which of the following is an irrational number?

Possible Answers:

$\frac{21}{5}$

$\pi$

$\sqrt{9}$

5.75

$0.\overline{3333}$

Correct answer:

$\pi$

Explanation:

A rational number can be expressed as a fraction of integers, while an irrational number cannot.

$0.\overline{3333}$ can be written as $\frac{1}{3}$ .

$\sqrt{9}$ is simply , which is a rational number.

The number 5.75 can be rewritten as a fraction of whole numbers, $\frac{23}{4}$ , which makes it a rational number.

$\frac{21}{5}$ is also a rational number because it is a ratio of whole numbers.

The number, $\pi$ , on the other hand, is irrational, since it has an irregular sequence of numbers ( 3.14159 ...) that cannot be written as a fraction.

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Example Question #1 : Number Sets

If $A= \left \{ 10, 20, 30, 40, 50 \right \}$ , $B=\left \{ 10, 20, 40, 60 \right \}$ , and $C=\left \{ 20, 30, 40, 60 \right \}$ , then find the following set:

$A\cup B$

Possible Answers:

$\left \{ 10, 20, 30, 40, 50 \right \}$

$\left \{ 10, 20, 40 \right \}$

$\left \{ 10, 20, 40, 60 \right \}$

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

$\left \{ 10, 20, 40, 50, 60 \right \}$

Correct answer:

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

Explanation:

The union is the set that contains all the numbers from $A= \left \{ 10, 20, 30, 40, 50 \right \}$ and $B=\left \{ 10, 20, 40, 60 \right \}$ . Therefore the union is $\left \{ 10, 20, 30, 40, 50, 60 \right \}$ .

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Example Question #2 : Number Sets

If $A= \left \{ 10, 20, 30, 40, 50 \right \}$ , $B=\left \{ 10, 20, 40, 60 \right \}$ , and $C=\left \{ 20, 30, 40, 60\right \}$ , find the following set:

$A\cap B\cap C$

Possible Answers:

$\left \{ 20, 40, 60 \right \}$

$\left \{ 20, 40 \right \}$

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

$\left \{ 20, 30, 40 \right \}$

$\left \{ 40 \right \}$

Correct answer:

$\left \{ 20, 40 \right \}$

Explanation:

The intersection is the set that contains only the numbers found in all three sets. Therefore the intersection is $\left \{ 20, 40 \right \}$ .

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Example Question #71 : Number Theory

If $A= \left \{ 10, 20, 30, 40, 50 \right \}$ , $B=\left \{ 10, 20, 40, 60 \right \}$ , and $C=\left \{ 20, 30, 40, 60 \right \}$ , find the following set:

$B\cap C$

Possible Answers:

$\left \{ 20, 40, 60 \right \}$

$\left \{10, 20, 40 \right \}$

$\left \{ 40, 60 \right \}$

$\left \{ 20, 40 \right \}$

$\left \{ 10, 20, 40, 60 \right \}$

Correct answer:

$\left \{ 20, 40, 60 \right \}$

Explanation:

The intersection is the set that contains the numbers that appear in both $B=\left \{ 10, 20, 40, 60 \right \}$ and $C=\left \{ 20, 30, 40, 60 \right \}$ . Therefore the intersection is $\left \{ 20, 40, 60 \right \}$ .

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Example Question #3 : Number Sets

If $A=\left \{ 10, 20, 30, 40, 50\right \}$ , $B=\left \{ 10, 20, 40, 60 \right \}$ , and $C=\left \{ 20, 30, 40, 60 \right \}$ , find the following set:

$A\cap C$

Possible Answers:

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

$\left \{ 30, 40 \right \}$

$\left \{ 20, 30, 40, 60 \right \}$

$\left \{ 20, 40 \right \}$

$\left \{ 20, 30, 40 \right \}$

Correct answer:

$\left \{ 20, 30, 40 \right \}$

Explanation:

The intersection is the set that contains the numbers found in both sets. Therefore the intersection is $\left \{ 20, 30, 40 \right \}$ .

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Example Question #5131 : Algebra Ii

If $A=\left \{ 10, 20, 30, 40, 50\right \}$ , $B=\left \{ 10, 20, 40, 60 \right \}$ , and $C=\left \{ 20, 30, 40, 60\right \}$ , find the following set:

$A\cup B\cup C$

Possible Answers:

$\left \{ 10, 20, 30, 40, 50 \right \}$

$\left \{ 10, 20, 40, 60 \right \}$

$\left \{ 20, 40, 60 \right \}$

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

$\left \{ 40, 60 \right \}$

Correct answer:

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

Explanation:

The union is the set that contains all of the numbers found in all three sets. Therefore the union is $\left \{ 10, 20, 30, 40, 50, 60 \right \}$ . You do not need to re-write the numbers that appear more than once.

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Example Question #82 : Number Theory

If $A=\left \{ 10, 20, 30, 40, 50\right \}$ , $B=\left \{ 10, 20, 40, 60\right \}$ , and $C=\left \{ 20, 30, 40, 60\right \}$ , find the following set:

$A\cap B$

Possible Answers:

$\left \{ 20, 40, 60 \right \}$

$\left \{ 10, 20, 30, 40, 50, 60 \right \}$

$\left \{ 10, 20, 40, 60 \right \}$

$\left \{ 10, 20, 40 \right \}$

$\left \{ 20, 40 \right \}$

Correct answer:

$\left \{ 10, 20, 40 \right \}$

Explanation:

The intersection is the set that contains the numbers found in both sets. Therefore the intersection is $\left \{ 10, 20, 40 \right \}$ .

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Example Question #1 : Number Sets

Sets3

Which set of numbers represents the union of E and F?

Possible Answers:

70,15

35,60,15,70,250

60,15,75,140,250,70

70,15,60,75

{35,70,15,60,75,250}

Correct answer:

{35,70,15,60,75,250}

Explanation:

The union is the set of numbers that lie in set E or in set F.

. Sets3

In this problem set E contains terms 35,60,15,70 , and set F contains terms 250,70,15,75 . Therefore, the union of these two sets is 35,60,15,70,75,250 .

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Example Question #3442 : Algebra 1

Express the following in Set Builder Notation:

$\left ( -\infty , -3\ \right )\cup \left ( -3, 1 \right )\cup \left ( 1, \infty \right )$

Possible Answers:

$\left \{ x|-\infty < x< 1 \right \}$

$\left \{ x|-3< x< \infty \right \}$

$\left \{ x|-\infty < x< -3 \right \}$

$\left \{ x|-3< x< 1 \right \}$

$\left \{ x|-\infty< x< -3 \right\ OR\ -3< x< 1\ OR\ 1< x< \infty \}$

Correct answer:

$\left \{ x|-\infty< x< -3 \right\ OR\ -3< x< 1\ OR\ 1< x< \infty \}$

Explanation:

$\left ( -\infty , -3 \right ) = \left \{x| -\infty < x< -3 \right \}$

and $\cup$ stands for OR in Set Builder Notation

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Example Question #1 : Number Sets

Find the intersection of the two sets:

$A=\left \{ 1, 2, 3, 4, 5, 6, 7, 8 \right \}, B=\left \{ 2, 4, 6, 7, 9 \right \}$

Possible Answers:

$\left \{ 2, 4, 6, 7 \right \}$

$\left \{ \right \}$

$\left \{ 1, 3, 5, 8, 9 \right \}$

$\left \{ 1, 2, 3, 4, 5, 6, 7, 8,9 \right \}$

Correct answer:

$\left \{ 2, 4, 6, 7 \right \}$

Explanation:

To find the intersection of the two sets, $A\cap B$ , we must find the elements that are shared by both sets:

$\left \{ 2, 4, 6, 7 \right \}$

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Algebra II : Algebra II

Study concepts, example questions & explanations for Algebra II

All Algebra II Resources

Example Questions

Example Question #5 : Irrational Numbers

Example Question #1 : Number Sets

Example Question #2 : Number Sets

Example Question #71 : Number Theory

Example Question #3 : Number Sets

Example Question #5131 : Algebra Ii

Example Question #82 : Number Theory

Example Question #1 : Number Sets

Example Question #3442 : Algebra 1

Example Question #1 : Number Sets

All Algebra II Resources

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