Correct Answer: A

Rationale: To calculate the volume to administer, divide the desired dose by the available concentration. In this case, (80 mg / 10 mg/mL) = 8 mL.

Correct Answer: A

Rationale: Metformin should be taken with meals to reduce gastrointestinal side effects and to ensure better absorption.

Correct Answer: D

Rationale: The correct answer is the 32-year-old man with essential hypertension. Individuals who did not receive two doses of the varicella vaccine earlier in life should be immunized. Essential hypertension is not a contraindication for the varicella vaccine. Administering the vaccine to pregnant women, individuals with severe neomycin allergies, or infants is contraindicated.

Correct Answer: A

Rationale: The nurse should instruct the client to use a soft-bristled toothbrush to prevent bleeding, which can occur due to chemotherapy-induced thrombocytopenia.

Correct Answer: A

Rationale: Bevacizumab is known to cause hypertension as a common adverse effect. The nurse should closely monitor the client's blood pressure to detect and manage this potential side effect promptly.