Hoop rolling down incline

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A cylindrical hoop with a radius of 10.0 cm and mass of 0.550 kg rolls down a 5.70 m incline at an angle of 18.0 degrees, achieving a kinetic energy of 9.49 J and a velocity of 4.15 m/s at the base. To determine the minimum coefficient of static friction required for the hoop to roll without slipping, it is essential to analyze the forces acting on the hoop using a free body diagram. Applying Newton's second law for both rotational and translational motion will provide the necessary calculations. This approach will help in finding the required static friction coefficient. Understanding these principles is crucial for solving the problem effectively.
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This a question from my 131 "masteringphysics.com" hw.

A cylindrical hoop has radius 10.0 cm and mass 0.550 kg. It rolls from rest a distance of 5.70 m along a board which is tipped up by an angle 18.0 degrees from horizontal. Regard the hoop as being much thinner (in the radial direction) than its radius.

Parts A and B wanted me to find the total kinetic energy and velocity at the base of the incline, I already did these. KE = 9.49 J and v=4.15 m/s

However part C wants me to:
What minimum value must the coefficient of static friction have if the hoop is to roll without slipping?
I have no idea how to approach this part.
 
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Start by drawing a free body diagram showing all forces acting on the hoop. Then apply Newton's 2nd law for both rotation and translation.
 

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