Concave mirror with 3.30x magnification and 40 cm radius

[I_LuV_FiZiX]

Homework Statement

A concave shaving mirror has a radius of curvature of 40 cm. It is positioned so that the (upright) image of a man's face is 3.30 times the size of the face. How far is the mirror from the face?

Homework Equations

M = Si/S 1/S + 1/Si = 2/R

The Attempt at a Solution

I have 2 equations with 2 unknowns. I isolated Si in the first one and substituted this expression into equation 2 to find S. I get an answer of 26.1cm.

The computer keeps telling me I'm wrong though. Could someone check my math or tell me if my equation setup is correct?

 

[I_LuV_FiZiX]

oops never mind i got it... 13.94cm