A circuit having a resistance, an inductance, and a capacitance in series is connected to a $110-\mathrm{V}$ ac line. For the circuit, $R=9.0 \Omega$, $X_{L}=28 \Omega$, and $X_{C}=16 \Omega .$ Compute $(a)$ the impedance of the circuit, $(b)$ the current, $(c)$ the phase angle between the current and the supply voltage, and $(d)$ the power factor of the circuit.