Final answer:
The Law of Detachment can be used to determine that statement (3) is a valid conclusion to statements (1) and (2).
Step-by-step explanation:
The law that can be used to determine that statement (3) is a valid conclusion to statements (1) and (2) is the Law of Detachment. The Law of Detachment states that if a conditional statement p ➞ q is true and p is also true, then q must be true as well. In this scenario, statement (1) 'If you sign up for remind, then you will receive classroom updates' is the conditional statement, and statement (2) 'You signed up for remind' is the given truth. Therefore, we can conclude that statement (3) 'You will receive classroom updates' is true.
Learn more about Law of Detachment