Answer this please its hard to understand

Which of the following will form the composite function?

Situation: . find the substance's half-life, in days. round your answer to the nearest tenth. a 11 gram sample of a substance that's used to treat thyroid disorders has a k. value of 0.1247. enter the correct answer n - noekt done no - initial mass (at time t = 0) n - mass at timet k a positive constant that depends on the substance itself and on the units used to measure time t= time, in days

Tonya paid 10$ for a new dvd in this transaction money is aa• store of valueb• medium of exchangec•unit of account