Hi. I must first say that I am not the greatest with math and I absolutely hate it lol, but here are the answers and rationales that I came up with. Hope this helps! 1. 10 units/hr. Rationale: 250 units per 100ml. 2.5 units per ML and its running at 4ml/hr. 2. This problem I used the same formula. I just figured out how many units per ML which gave me my answer of 912units/hour 3. I believe the formula for this problem is rate (85ml)÷60minutesX 20(drip factor). This should give you gtts/minute. 4. I multipled the pts weight(15kg) by 60mg which is 900mg. Divided into 3 doses is 300mg which equals 3ml per dose. 5. I think you have to convert 80mg to grams. Then use the formula for D/H = 13.33ml/hr ONCE AGAIN....I am not the greatest with math! I hope this helps, good luck!