B2 - Point A is between points M and C. If MC = 17 and AM = 8, find the measure of segment AC. Also could you help on those too

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