Area of a Garden Mary's backyard vegetable garden mea- sures 20 ft by 30 ft, so its area is 20 × 30 = 600 ft?. She decides to make it longer, as shown in the figure, so that the arca increases to A = 20(30 + x). Which property of real numbers tells us that the new area can also be written A = 600 + 20x? 30 ft 20 ft

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