Five-Minute Check (over Lesson 2 1) Then/Now New Vocabulary Example 1: Truth Values of Conjunctions Example 2: Truth Values of Disjunctions Concept
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2 Five-Minute Check (over Lesson 2 1) Then/Now New Vocabulary Example 1: Truth Values of Conjunctions Example 2: Truth Values of Disjunctions Concept Summary: Negation, Conjunction, Disjunction Example 3: Construct Truth Tables Example 4: Real-World Example: Use Venn Diagrams
3 Over Lesson 2 1 Make a conjecture about the next item in the sequence. 1, 4, 9, 16, 25 A. 30 B. 34 C. 36 D. 40 A B A. A B. B C. C 0% D. D 0% 0% 0% C D
4 Over Lesson 2 1 Make a conjecture about the next item in the sequence. A. B. C. D. A B A. A B. B C. C 0% D. D 0% 0% 0% C D
5 Over Lesson 2 1 Determine whether the conjecture is true or false. Given: ABC, if m A = 60, m B = 60, and m C = 60. Conjecture: ABC is an equilateral triangle. A. true B. false A. A B. B 0% 0% A B
6 Over Lesson 2 1 Determine whether the conjecture is true or false. Given: 1 and 2 are supplementary angles. Conjecture: 1 and 2 are congruent. A. true B. false; m 1 = 70 and m 2 = 110 A. A B. B 0% 0% A B
7 Over Lesson 2 1 Determine whether the conjecture is true or false. Given: RST has two congruent sides. Conjecture: A. true B. false; A. A B. B 0% 0% A B
8 Over Lesson 2 1 Find the next two terms in the sequence 243, 81, 27, 9,... A. 3, 1 B. 3, 1 C. 3, 1 D. 3, 1 A B A. A B. B C. C 0% D. D 0% 0% 0% C D
9 You found counterexamples for false conjectures. (Lesson 2 1) Determine truth values of negations, conjunctions, and disjunctions, and represent them using Venn diagrams. Find counterexamples.
10 statement truth value negation compound statement conjunction disjunction truth table
11 Truth Values of Conjunctions A. Use the following statements to write a compound statement for the conjunction p and q. Then find its truth value. p: One foot is 14 inches. q: September has 30 days. r: A plane is defined by three noncollinear points. Answer: p and q: One foot is 14 inches, and September has 30 days. Although q is true, p is false. So, the conjunction of p and q is false.
12 Truth Values of Conjunctions B. Use the following statements to write a compound statement for the conjunction ~p r. Then find its truth value. p: One foot is 14 inches. q: September has 30 days. r: A plane is defined by three noncollinear points. Answer: ~p r : A foot is not 14 inches, and a plane is defined by three noncollinear points. ~p r is true, because ~p is true and r is true.
13 A. Use the following statements to write a compound statement for p and r. Then find its truth value. p: June is the sixth month of the year. q: A square has five sides. r: A turtle is a bird. A. A square has five sides and a turtle is a bird; false. B. June is the sixth month of the year and a turtle is a bird; true. C. June is the sixth month of the year and a square has five sides; false. D. June is the sixth month of the year and a turtle is a bird; false. A A. A B. B C. C 0% 0% 0% 0% B C D D. D
14 B. Use the following statements to write a compound statement for ~q ~r. Then find its truth value. p: June is the sixth month of the year. q: A square has five sides. r: A turtle is a bird. A. A square has five sides and a turtle is not a bird; true. B. A square does not have five sides and a turtle is not a bird; true. C. A square does not have five sides and a turtle is a bird; false. D. A turtle is not a bird and June is the sixth month of the year; true. A B A. A B. B 0% C. C 0% 0% 0% D. D C D
15 Truth Values of Disjunctions A. Use the following statements to write a compound statement for the disjunction p or q. Then find its truth value. p: is proper notation for segment AB. q: Centimeters are metric units. r: 9 is a prime number. Answer: is proper notation for segment AB, or centimeters are metric units. Both p and q are true, so p or q is true.
16 Truth Values of Disjunctions B. Use the following statements to write a compound statement for the disjunction q r. Then find its truth value. p: is proper notation for segment AB. q: Centimeters are metric units. r: 9 is a prime number. Answer: Centimeters are metric units, or 9 is a prime number. q r is true because q is true. It does not matter that r is false.
17 Truth Values of Disjunctions C. Use the following statements to write a compound statement for the disjunction ~ p r. Then find its truth value. p: is proper notation for segment AB. q: Centimeters are metric units. r: 9 is a prime number. Answer: AB is not proper notation for segment AB, or 9 is a prime number. Since not p and r are both false, ~p r is false.
18 A. Use the following statements to write a compound statement for p or r. Then find its truth value. p: 6 is an even number. q: A cow has 12 legs r: A triangle has 3 sides. A. 6 is an even number or a cow has 12 legs; true. B. 6 is an even number or a triangle has 3 sides; true. C. A cow does not have 12 legs or 6 is an even number; true. D. 6 is an even number or a triangle does not have 3 side; true. A A. A B. B C. C 0% 0% 0% 0% B C D D. D
19 B. Use the following statements to write a compound statement for ~q ~r. Then find its truth value. p: 6 is an even number. q: A cow has 12 legs. r: A triangle has 3 sides. A. A cow does not have 12 legs or a triangle does not have 3 sides; true. B. A cow has 12 legs or a triangle has 3 sides; true. C. 6 is an even number or a triangle has 3 sides; true. D. A cow does not have 12 legs and a triangle does not have 3 sides; false. A A. A B. B C. C 0% 0% 0% 0% B C D D. D
20 C. Use the following statements to write a compound statement for ~p q. Then find its truth value. p: 6 is an even number. q: A cow has 12 legs. r: A triangle has 3 sides. A. 6 is an even number or a cow has 12 legs; true. B. 6 is not an even number or a cow does not have 12 legs; true. C. A cow does not have 12 legs, or a triangle has 3 sides; true. D. 6 is not an even number or a cow has 12 legs; false. A A. A B. B C. C 0% 0% 0% 0% B C D D. D
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22 Construct Truth Tables A. Construct a truth table for ~p q. Step 1 Make columns with the heading p, q, ~p, and ~p q.
23 Construct Truth Tables A. Construct a truth table for ~p q. Step 2 List the possible combinations of truth values for p and q.
24 Construct Truth Tables A. Construct a truth table for ~p q. Step 3 Use the truth values of p to determine the truth values of ~p.
25 Construct Truth Tables A. Construct a truth table for ~p q. Step 4 Use the truth values of ~p and q to write the truth values for ~p q. Answer:
26 Construct Truth Tables B. Construct a truth table for p (~q r). Step 1 Make columns with the headings p, q, r, ~q, ~q r, and p (~q r).
27 Construct Truth Tables B. Construct a truth table for p (~q r). Step 2 List the possible combinations of truth values for p, q, and r.
28 Construct Truth Tables B. Construct a truth table for p (~q r). Step 3 Use the truth values of q to determine the truth values of ~q.
29 Construct Truth Tables B. Construct a truth table for p (~q r). Step 4 Use the truth values for q and r to write the truth values for ~q r.
30 Construct Truth Tables B. Construct a truth table for p (~q r). Step 5 Use the truth values for ~q r and p to write the truth values for p (~q r). Answer:
31 A. Which sequence of Ts and Fs would correctly complete the last column of the following truth table for the given compound statement? (p q) (q r) A. T B. T C. T D. T F F F F F T F T F F F F T T F T F F F F T T F F F F F F A A. A B. B C. C B D. 0% D 0% 0% 0% C D
32 B. Which sequence of Ts and Fs would correctly complete the last column of the following truth table for the given compound statement? (p q) (q r) A. T B. T C. T D. T T T F T T T T T F T F F T T T T F T F T T T F T F F F F A B A. A B. B C. C D. 0% D 0% 0% 0% C D
33 Use Venn Diagrams DANCING The Venn diagram shows the number of students enrolled in Monique s Dance School for tap, jazz, and ballet classes. A. How many students are enrolled in all three classes? The students that are enrolled in all three classes are represented by the intersection of all three sets. Answer: There are 9 students enrolled in all three classes.
34 Use Venn Diagrams DANCING The Venn diagram shows the number of students enrolled in Monique s Dance School for tap, jazz, and ballet classes. B. How many students are enrolled in tap or ballet? The students that are enrolled in tap or ballet are represented by the union of these two sets. Answer: There are or 121 students enrolled in tap or ballet.
35 Use Venn Diagrams DANCING The Venn diagram shows the number of students enrolled in Monique s Dance School for tap, jazz, and ballet classes. C. How many students are enrolled in jazz and ballet, but not tap? The students that are enrolled in jazz and ballet and not tap are represented by the intersection of jazz and ballet minus any students enrolled in tap. Answer: There are or 25 students enrolled in jazz and ballet and not tap.
36 PETS The Venn diagram shows the number of students at Manhattan School that have dogs, cats, and birds as household pets. A. How many students in Manhattan School have one of three types of pets? A. 226 B. 311 C. 301 D % 0% 0% 0% Pets A. A B. B C. C D. D A B C D
37 PETS The Venn diagram shows the number of students at Manhattan School that have dogs, cats, and birds as household pets. B. How many students have dogs or cats? A. 57 B. 242 C. 252 D. 280 A 0% 0% 0% 0% B C D Pets A. A B. B C. C D. D
38 PETS The Venn diagram shows the number of students at Manhattan School that have dogs, cats, and birds as household pets. C. How many students have dogs, cats, and birds as pets? A. 10 B. 85 C. 116 D % 0% 0% 0% Pets A. A B. B C. C D. D A B C D
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