Your 10 year-old CF patient will be receiving broad spectrum…

Your 10 year-old CF patient will be receiving broad spectrum antibiotics. Her weight is 70lbs. 1. Cephalosporin will the the first antibiotic on a schedule of 7.5mg/kg. 2. Tobramycin via IV will be the second antibiotic on a schedule of 6mg/kg. This total dose should be given over 4 doses at a frequency of qid. How much will the first dose be? Show all your work.