Power Systems Theory Definitions and Formulas

Hi there, I need some help in these define and state questions

Define
(a) The fault level of a system or unit in a system
(b) base MVA

State
(c) the equation for percentage impedance or impedance voltage
(d) the relationship between X% and Xpu
(e) the units of X% and Xpu
(f) Xpu in terms of the fault level MVA and the base MVA

Thanks

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