Physics mirror problem.. please help?

Katie

New member
A convex spherical mirror forms a virtual image 0.48 times the size of the object. The object distance is 11.5 cm. Find the magnitude of the radius of curvature of the mirror.
Answer in units of cm.
I have used 1/p + 1/q= 2/R and I don't know if I am just incorrectly doing the math but I got the answer 14.345 but it wasn't right.
 
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