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Data warehouse is a house where current as well as historical data can be stored.
They don't, they become historical data but the facts/numbers are still what they were when the measurement were recoded.
Mathematics can be used to complete precise measurements that can be easily presented and evaluated in mathematical form.
This forecasting model uses historical data to try to predict future events.
One definite drawback is that it is usually derived based on historical data and does not take into account future factors.