Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here. Below are the answers:
1a:
(1.6 * 60) = growth per hour, GPH
(GPH * 24) = Growth per day.
1b:
1N = 101.971621g (let's say 102g)
so 0.15 * 102 = increase in grams, IIG
IIG * 1000 = increase in milligrams, IIM
IIM / 1.6 = how many minutes to reach that weight.