Identify the form of the following argument and to determine whether the argument is valid or invalid.

Question

If Tanner won't be at work tomorrow, then he must try to find a substitute. He won't be at work tomorrow. Therefore, he must try to find a substitute.
Valid
p→ q
q→r
pr
• Valid
p-q
~p
~q
Invalid
p-q
~p
~q
O Valid
p-q
q
Invalid
pq
q

Answer 1

This is a valid argument. It is in a valid form of modus ponens:

p → q
p
∴ q

In this case:
p = Tanner won't be at work tomorrow
q = He must try to find a substitute

Therefore, the argument is valid.