A series RLC circuit with a resistance of 400- has capacitive and inductive reactances of 300- and

A series RLC circuit with a resistance of 400-Ω has capacitive and inductive reactances of 300-Ω and 500-Ω, respectively.
(a) What is the power factor of the circuit?
(b) If the circuit operates at 60 Hz, what additional capacitance should be connected to the original capacitance to give a power factor of unity, and how should the capacitors be connected?