Question #19 in 2.4
A square picture with an area of 100cm^2 is mounted on matting 2.5 times the area of the picture. If the picture is centered on the matting, what is the width of the matting that is showing? Give your answer to the nearest tenth of a cm.
this is my work:
the square root of 100=10
the square root of 250=15.8113883
the width of the visible matting, to the nearest tenth of a cm. is, 2.9cm^2