Friction, speed, and radius of a curve?

[V.elizabeth.k]

Homework Statement

Suppose the coefficient of static friction between the road and the tires on a car is 0.789 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve of 39.3 m radius?

Homework Equations

i know the equation for uniform circular motion is a=(v^2)/r
verge of sliding means f(s,max)=mu(s)*F(n)

The Attempt at a Solution

and seriously, I have no idea where to start.

 

[rock.freak667]

Well shouldn't the frictional force provide the centripetal force required?