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10) Enlarging by a factor of 7 corresponds to an increase by a factor of  for the area, or 49. The new rectangle has area 980 square-inches.

To verify, let's say the dimensions of the original rectangle are . We increase each dimension by a factor of 7 to get . This new area is 980 square-inches. 

11) We use the same concept. Increasing by a factor of 0.6 corresponds to increasing the area by  (n.b., an increase by a factor less than 1 is shrinking). Original area is . New area is .

12) We multiply 15 by 11/30 to get 5.5 ft. We multiply 8.25 by the same factor to get 3.025 ft. The area is .

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