A lawn is 21 feet wide and 39 feet long. How much will it cost to weed and feed it if a gardening service charges $0.40 per square yard for this treatment?

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Since 3 feet = 1 yard, convert the length and width to yards by dividing their dimensions in feet by 3. Width = 39/3 = 7 yards; 39 length = 39/3 = 13 yards The area of a rectangle is the product of its length and width. Area = 7 x 13 = 91 square yards The cost for the entire lawn is obtained by multiplying the area in square yards by the cost per square yard. 91 x $.40 = $36.40

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