(plz hurry) in 7 hr, kerrie can travel 6 mi upriver and come back. the rate of the current is 3 mph. find the rate of her boat in still water.

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