A nurse is caring for a client who has gastroenteritis and is reviewing the client's findings from two days ago and today. Which of the following findings require immediate follow-up?

The client is confused and appears weak.

The client's oral mucosa is dry and tongue is furrowed.

The client's temperature is 37.4° C (99.3° F).

The client's blood pressure is 90/58 mm Hg.