Final answer:
The nurse should teach the patient with stress incontinence to perform pelvic floor muscle exercises 40 to 50 times per day.
Step-by-step explanation:
The best thing the nurse should teach the patient with stress incontinence is to perform pelvic floor muscle exercises 40 to 50 times per day. These exercises, also known as Kegel exercises, can help strengthen the pelvic muscles and improve bladder control. By regularly doing these exercises, the patient may experience a reduction in stress incontinence symptoms.