There would be less confusion and less waste. If you order something 6 units long there would be no question as to how long. The billion dollar Mars Observer was lost (it flew past Mars) because the engineers sent a command to burn a certain amount of fuel in order to correct the spacecraft's trajectory but they calculated and sent the value in cubic feet per minute while the spacecraft was designed to operate with liters per second.
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Feet are a measurement in the Imperial system. If she was using Metric it would be in meters, not feet.
quit using wikianswers to answer your ied homework nub.
the measurement is not always exact and say you were to measure a football field and your measurement were to be exact it would be close to impossible
There are 3 significant figures
order of importance