Mel has to put the greatest number of bolts and nuts in each box so each box has the same number of bolts and the same number of nuts. Should Mel use the greatest common factor or the least common multiple to solve the problem?

For a short time after a wave is created by wind , the height of the wave can be modeled using y= a sin 2pi(t) / t where a is the amplitude and t is the period of the wave in seconds. how many times over the first 5 seconds does the graph predict the wave to be 2 feet high?