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Bellringer

Bellringer. Make sure your name is on Last Week’s Bellringers and turn them in to your Class Bin Have your Notes and HW out on your desk Work on p. 105 #21 – 23 I remembered after class on Friday, that I did not give attendance Pi Dollars last week. I will do that at the end of today.

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Bellringer

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  1. Bellringer • Make sure your name is on Last Week’s Bellringers and turn them in to your Class Bin • Have your Notes and HW out on your desk • Work on p. 105 #21 – 23 • I remembered after class on Friday, that I did not give attendance Pi Dollars last week. I will do that at the end of today.

  2. Homework Review

  3. Section 2.4 Deductive Reasoning

  4. Back to the Car example… • If Coach Combs’ car is out of gas, then it will not start. • Coach Combs’ car is out of gas. What can we conclude? • Coach Combs’ car will not start. What can we conclude?

  5. Law of Detachment • If the hypothesis of a true conditional is true, then the conclusion is true. • But you CANNOT assume and go backwards • What can we conclude? • If there is lightning, then it is not safe to be out in the open. Maria sees lightning from the soccer field.

  6. Law of Detachment • If the hypothesis of a true conditional is true, then the conclusion is true. • But you CANNOT assume and go backwards • What can we conclude? • If it is Tuesday, then you will go bowling. You go bowling.

  7. Car Example • If Coach Combs’ car is out of gas, then it will not start. • If it will not start, then Coach Combs will be late to school. • What can we conclude?

  8. Law of Syllogism • If we have two conditional statements and the conclusion of one matches the hypothesis of the other, then we can combine them as one conditional statement • If it is Saturday, then you walk to work. • If you walk to work, then you wear sneakers.

  9. Using Both • If you live in Accra, then you live in Ghana. • If you live in Ghana, then you live in Africa. • Aissa lives in Accra. • Try drawing a conclusion on p. 109 “Got It?” #3a

  10. Quick Guide to Help… • Law of Detachment Given a conditional and a fact. Your answer will be a fact (or no conclusion) • Law of Syllogism Given 2 conditional statements. Your answer will be a conditional statement (or no conclusion)

  11. Homework • p. 110 #6 – 29, skip #25 • Quiz Tomorrow • Test next Tuesday

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