What is Mrs. Gordon's rate from 0 to 2 seconds? 2.5 feet per second.4 feet per second5 feet per second.2 feet per second

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