Answer:
Step-by-step explanation:
From that moment forward, the medicine concentration drop by 30% each hour. It means that the rate at which the medicine concentration is dropping is exponential. We would apply the formula for exponential decay which is expressed as
A = P(1 - r)^t
Where
P represents the initial concentration.
A represents the final concentration after t hours.
t represents the number of hours.
r represents the rate
From the information given
P = 120 mg/L
r = 30% = 30/100 = 0.3
The expression becomes
C(t) = 120(1 - 0.3)^t
C(t) = 120(0.7)^t
