A formula is neither metric nor customary.
Sometimes the same formula will apply for both systems, only the units will change: for example, average speed = distance/time. In other cases the coefficients may change.
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The opposing systems are imperial and metric, not customary. But, meters are metric.
Feet are a measurement in the Imperial system. If she was using Metric it would be in meters, not feet.
Depends on if by 'customary' you're referring to a short ton or a long ton. A short ton is less than a metric ton; a long ton is more than a metric ton.
customary
It would be yards.