9. A so-called Norman window consists of arectangle surmounted by a semicircle as shown in the diagram. The total perimeter of the window is to be 24 feet. Express the total area A of the window as a function of x. A. A = 24x – 2x² + nx² В. А %3D 24х — 2x2 — пх? С. А %3 48x-4x²-rx² 48x-4x+rx A =

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