Final answer:
The nurse would most likely perform a physical examination on the child.
Step-by-step explanation:
In this case, the nurse would most likely perform a physical examination on the 9-year-old child complaining of pain in the lower right quadrant of the abdomen, nausea, and constipation, accompanied by a fever of 101 degrees F. A physical examination would help the nurse assess the child's vital signs, perform a focused abdominal examination to check for signs of inflammation or tenderness in the right lower quadrant, and gather additional information about the child's symptoms. It is an important first step in evaluating the child's condition and determining the appropriate course of treatment.