In the following argument, identify either the extra claims, or express the implied claim. the barometer shows the pressure is falling. you had better take an umbrella with you.

In my opinion, the implied claim here is "You had better take an umbrella with you." It is a claim that can be inferred from the first claim about the barometer showing the pressure. An implied claim doesn't have to be explicitly said. It comes as a conclusion to the premise. When your mother tells you about the weather forecast while you are preparing to leave, she usually implies that you should dress accordingly.

Since the barometer is falling, the extra claim in the statement is that a falling barometer indicates that rain will be in the immediate forecast. Stating that you should bring an umbrella with you suggest the falling barometer implies rain.