Answer:
60 milligrams
Step-by-step explanation:
just cross multiply! percentages are just fractions of 100. so you can say that 
multiple 75 by x and 45 by 100 and you get
4500=75x
divide both sides by 75 and you get 60
Attached below is the problem that I worked out. And I checked my answer simply by plugging it in
<span>5+x+(−2)=−8
5 + x - 2 = -8
x + 3 = -8
x = -11</span>
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