Question

Jillana takes a single dose of medication that remains in her body according to the equation r = 200(0.75)d, where r represents the amount of medication remaining after d days. If Jillana had taken the medication two days earlier, the amount of medication remaining in her system relative to the amount that remains in her system after d      days would be represented using the equation r2 = 200(0.75)d + 4. Which of the following is an equivalent equation?

Answer 1

I looked at another online and it said letter A. (Not 100% sure)