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I need help calculating the magnitude of the impedance for a RLC circuit shown below. See the attached schematic.

I found the impedance magnitude of a similar circuit here:

Impedance Formulas

...see the 4th circuit from the bottom (let's call its impedance Z_a).

Unfortunately, I do not know how to include the series resistance Rx into this formula.

The problem I am having is whether to use the formula:

Z = Rx + Z_a

...or

Z = (Rx^2 + ?)^0.5

Also, I am not sure whether the value of the Rx will alter the phase angle between current and voltage of this circuit?

I found the impedance magnitude of a similar circuit here:

Impedance Formulas

...see the 4th circuit from the bottom (let's call its impedance Z_a).

Unfortunately, I do not know how to include the series resistance Rx into this formula.

The problem I am having is whether to use the formula:

Z = Rx + Z_a

...or

Z = (Rx^2 + ?)^0.5

Also, I am not sure whether the value of the Rx will alter the phase angle between current and voltage of this circuit?