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Why do interests rates on loans to be lower in a weak economy than in a strong one

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π