Math Is Fun Forum

Ok, so I know this more electronic than maths but I'm guessing you guys might have a logical way of thinking about it???

So my tutor has asked me to calculate impedance Z of a series circuit and all the info I had was,

A capacitor with the value of 300 uF
A inductor with a 800 mH

From there I have calculated the resonant frequency which is 10.3Hz AND the capacitive reactance which is 51.50 Ohms

So , what I have now is this;

R = Unknown
L = 800 mH
C = 300 uF
F = 10.3 Hz
Xc = 51.50
Xl = Unknown
W = 2pieF

Is it possible to calculate Impedance Z if I do not know the value of the resistor? and if so how???

Z= sqrt R^2 + (Xl - Xc)^2

I know this wont be everyone's cup of tea but I'm just praying that one of you guys can help??

Many thanks in advance, even if it was just taking the time to look   and on another note I apologize for my lack of understanding of maths, this course I have nearly done bar this question, has encouraged me to enroll at collage to brush up.... it has been 20 years though 
Tom