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all right math time weve got a concave mirror and were given the focal length of eight centimeters weve got a four centimeter tall pencil and its six centimeters away from the mirror so weve given weve we have F eight centimeters we have the height of the object this is how tall it is so that is h o height of the object and we have where it is six centimeters away from the mirror so that is the distance of the object do the first thing were asked for is the image distance thats D I and they havent asked us for any heights here they gave us a height but they also gave us F and do which means to find the image distance I only need one over F equals 1 over D o plus 1 over D I now all weve to do is fill in some numbers f is 8 so 1 over F becomes 1 over 8 do is 6 so 1 over D o becomes 1 over 6 we dont have 1 over di thats what were going to be solving for now we need to do a little math 1/8 gives me 0.125 1/6 gives me 0.166 and it keeps going Im going to round it to 7 plus 1