Finding parallel resistance of an RLC circuit at resonance from V

[MeMoses]

Homework Statement

I need to be able to determine the equivalent parallel resistance of an RLC parallel circuit, from a measured voltage when the circuit is at resonance.

Homework Equations

The Attempt at a Solution

I know the values of the circuit element, but I'm not sure how one is supposed to use V to determine the resistance here. This feels like an incredibly easy problem but I'm stuck. I know at resonance R_p = Z, (R_p as the equivalent parallel resistance). Any help would be great

 

[gneill]

How is the circuit being driven (what's the source)?