Equivalent impedance in a series circuit, missing value

In a series circuit, with one sinusoidal voltage source in series with a capacitor, inductor, and resistor. How do you calculate the equivalent impedance if you only have the values for R=100ohms, C= 10mF, and v(t)=110cos(200t)?

Zeq=Zc+Zl+Zr = -j.5 + j200L + 100

This is as far as I have got...

You need to know the value of L in order to compute Zl.