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.

Homework Review

Deductive ReasoningSection 2.4

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?

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.

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.

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?

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.

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

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)

Homework

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