Exit Ticket: Unit 2 Review

Write the converse of the statement:
If an animal is a dog then it does not moo.  

• If an animal is not a dog then it does moo
• If an animal can moo then it is not a dog
• If an animal does not  moo then it is a dog
• An animal is a dog if and only if it can moo

Using the Law of Syllogism, which of the following completes the statement to form a valid conclusion?
If it is snowing heavily, then school will be canceled.
If school is canceled, the big test will not be given today.
It is snowing heavily, therefore

• look out for the snowplows while driving to school.
• the big test will not be given today.
• the roads will be hard to drive on.
• you should call the school to see if school is canceled.

• ~p $\rightarrow\$ q

• ~q $\rightarrow\$ p

• q $\rightarrow$ p

• ~p $\rightarrow$ ~q

Which of the following is a counterexample to the following conjecture? If  $x^2\ =\ 4$ , then x = 2

• x = 4

• x = -2

• x = 2

• x = -4

Write a definition of a right angle as a biconditional statement.

• An angle is a right angle if and only if it has a measure of 90 degrees.

• An angle has a measure of 90 degrees if and only if it is a right angle.

• Right angles are 90 degrees.

• If an angle is a right angle, then it has a measure of 90 degrees.