Please show all work and formulas

PROBLEM 3: A lens forms an image of an object. The object is do :=16.0.cm from the lens. The image is di:=12.0- cm from the lens on the same side as the object. (a) What is the focal length of the lens? Is the lens converging or diverging? (b) If the object is hot; =8.50 - mm tall, how tall is the image? Is it erect or inverted? (c) Draw a principal-ray diagram. (a) f=-0.5 m ( 6 ) M.=0.8 hima=6.4 mm (c) . no hint_see_ppt