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A car is travelling along a curve having a radius of 74.0m, banked at an angle of theta = 23 deg. The coefficient of static friction is 0.09. What is the slowest speed the car can negotiate the curve?

Relevant equations:

Fc = Fnet

Fc = mv^2/r

Fnet = [(tan(theta) + u)/(1-utan(theta))]mg

The attempt at a solution

v^2 = (74)[(tan23 + 0.09)/(1-0.09tan23)](9.8)

v = (387.92)^0.5

v= 19.70 m/s

This answer isn't being accepted by the online program we use in class and I can't figure out what I'm doing wrong. Any help would be much appreciate