#### Answer

If a is an integer, then a is even.
False. a=3 is a counterexample.
If a is an integer, then a is odd.
False, a=8 is a counterexample.
If a is an integer, then 2a is even.
True.
If a is an integer, then 2a is odd.
False. a=4 is a counterexample.
If a is an integer, then 2a+1 is odd.
True.

#### Work Step by Step

You can write a conditional statement for each of the 5 conjectures.