Hey guys whats up?

So I have a slight issue i missed a day of school and i have no idea how to solve this problem. Please help me? Show work too please/ explain so it makes sense lol. Thanks

If coT c = - radical 15 and <C is in quadrant IV, find csc C.

I'm lost all i got

CosC/sinC = - radical 15

Cos^2C/Sin^2C=15

and then (sinC)(-radical15)=cosC

I have no idea if this is even remotely correct please let me know and show what is next?

Thanks!!