Please help. These showed to be incorrect. :(

You are given a spherical mirror and Wish to determine its properties. You place an object on its axis, 38.5 cm in front of it, and discover that the mirror creates a virtual image located 17.1 cm from the mirror. Determine the mirror's focal length f in centimeters. 30.76 Incorrect Calculate the mirror's radius of curvature C in centimeters. 61.52 Incorrect If it can be determined, is the mirror concave or convex? O concave 0 cannot be determined 0 convex You have a concave spherical mirror with a 12.9 cm radius of curvature. You place an object on the mirror's axis, 19.7 cm in front of the mirror. How far is the object's image from the mirror? If it can be determined, is the image real or virtual? 0 cannot be determined If it can be determined, is the image upright or inverted with respect to the object? 0 cannot be determined 0 inverted O upright