The amount of a certain medication in a patient's body over time is given by the equation
A(t) = 5000.93)
where A represents the amount of medication (milligrams)
and t is time (hours). How many hours will it be before the
doctor must administer the medication again if it should
be repeated when the level of medication in the patient
decreases to 100 mg?

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24