3. The area (A) of a rectangle varies jointly as its length (l) and its width (w). The area of a rectangle (A) = 72cm$^2$ when l = 12 cm and w = 2 cm. Find the area (A) if the length (l) = 18 cm and its width (w) = 5 cm.
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We are given that the area (A) of a rectangle varies jointly as its length (I) and its width (w). This can be represented by the equation A = k * I * w, where k is the constant of variation. Show more…
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