5. 7.6.1.2 AABC has a side of length 3 and a side of
length 4.
Is there another triangle with one side of
length 3 and another side of length 4, but
the third side length is different? Explain
why or why not.

First convert the patients weight from lbs to kg
Look up (google lbs to kg) 100 lbs = 45.4 kg person

If this person gets 15 mg amoxicillin per 1 kg body weight

45.4 kg × 15 mg =  681 mg per day
times 7 days = 4,767 mg

Closest answer you have listed is B. It may be off a little depending on the lbs to kg conversion and rounding weight.