 Hello logicians. Now we are on the back side of the note sheet, maybe you're already on the back side of the note sheet, and we are going to write some compound statements, the instructions on the state that you are to write a compound statement for each conjunction or disjunction and to find the truth value. So for the first statement P, 10 plus 8 equals 80, that is a false statement. The statement Q, December has 31 days, that is a true statement. A rectangle has four sides, that is a true statement. Now we will write the compound statements. The first one is P with that symbol and Q, that symbol is AND, if you remember from your truth tables, the inverted V is the AND symbol. So the compound statement is 10 plus 8 equals 80 and December has 31 days. Next I need to determine the truth value. The statement P is false and the statement Q is true. When I have a false statement and a true statement, the final conclusion, the final statement is false. In order for that to be true with AND, they have to both be true. That is not the case. So this statement is a false statement. The next statement is Q and R. Pause the video as you did before and write the compound statement for Q and R. The compound statement written out is part Q, December has 31 days, the symbol was the word AND, a rectangle has four sides. Now we need to determine the truth value of this compound statement. Statement Q is true, statement R is true, so combined that statement, the compound statement is true because if you have true AND true, your combined statement is true. Next we will write the compound statement for P or R. Remember the inverted, I'm sorry, the V-shaped symbol is OR. So P or R. Pause the video and write the compound statement on your sheet. So the compound statement P or R is 10 plus 8 equals 80 or a rectangle has four sides. Now the truth value. 10 plus 80 is false and the symbol OR and a rectangle has four sides, that's true. With OR, only one of them has to be true, so the compound statement will be true. Pause the video and write the last compound statement. Remember the little squiggle in front of R is NOT, so this is going to be Q OR NOT R. So the compound statement for that would be December has 31 days, that statement Q OR a rectangle does NOT have four sides. And now the truth value. December has 31 days is true, a rectangle does NOT have four sides is false. So I have one statement true and one statement false. But with OR, I only need one of them true. So the final compound statement truth value is true.