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*A L-R-C series circuit contains a 1x10^-6 F capacitor, a 7.00 mH coil and a 90 ohm resistor. What is its resonant frequency?*

For this one I used the formula for capacitive reactance.

Xc=1/2pi*fC

After doing some algebra i isolated the frequency giving me :

f=(1/Xc)/2pi*C.

So i substitute all my values giving me:

f=(1/90)/2pi*1x10-6F...

The answer i get seems really wrong. Did I use the wrong formula?

Should i have used XL=2pi*fL?

I'm really at a loss for what to do with this problem

any help would be appreciated