Question

Pls help me with this question, I need the answer and the step pls! Pls! Help me!

Answer 1

10) Enlarging by a factor of 7 corresponds to an increase by a factor of $7^2$ 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 $5 \ in \times 4 \ in$. We increase each dimension by a factor of 7 to get $35 \ in \times 28 \ in$. 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 $0.6^2$ (n.b., an increase by a factor less than 1 is shrinking). Original area is $(30)(10)( \frac{1}{2})=150$. New area is $(150)(0.36)=54 \ cm^2$.

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 $5.5 \ ft \times 3.025 \ ft = 16.6375 \ ft^2$.