Joan completed ¾ of her sandwich in 1/3 of an hour. At this rate, how long will it take her to eat the rest of her sandwich? Show your work. (Repost because I didnt get answers last time)

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days