The hcp prescribes methotrexate 7.5 mg po weekly, in 3 divides doses for a child with rheumatoid arthritis whose body surface area (bsa) is 0.6 m2. the therapeutic dosage of methotrexate po is 5 to 15 mg/m2/week. how many mg should the nurse administer in each of the three doses given weekly? (enter the numeric value only. if round is required, round to the nearest tenth.)