To find out how many square feet will be added to the flowerbed, we first need to calculate the current area of the rectangle and then determine what 60% of that area is.
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Calculate the current area of the flowerbed: \[ \text{Area} = \text{length} \times \text{width} = 7 , \text{ft} \times 5 , \text{ft} = 35 , \text{sq ft} \]
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Calculate 60% of the current area: \[ \text{Area to be added} = 0.60 \times \text{current area} = 0.60 \times 35 , \text{sq ft} = 21 , \text{sq ft} \]
So, Annie will add 21 square feet to the flowerbed.