Each student in a pottery class is responsible for cleaning the area around his or her workspace at the end of the lesson. Each student's area is approximately 4 1/2 ft^2 . There are 13 students in the class. Assuming that each student cleans his or her area, how many square feet in total is cleaned? Solve the problem by each of these methods.

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