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『An object, 4.0 CM in size, is placed at 25.0 CM in front of concave mirror of focal length 15.0 CM. At what distance from the mirror should a screen be placed in order to obtain a sharp image? find the nature and size of the image.』

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The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in