A radio tuning circuit contains an RLC circuit with R = 5.0 and L = 2.8

Question:

A radio tuning circuit contains an RLC circuit with R = 5.0 Ω and L = 2.8 μH.
(a) What capacitance is needed to produce a resonance frequency of 85 MHz?
(b) If the capacitance is increased above the value found in part (a), will the impedance increase, decrease, or stay the same? Explain.
(c) Find the impedance of the circuit at resonance.
(d) Find the impedance of the circuit when the capacitance is 1% higher than the value found in part (a).