



 
Hi Kareena, You didn't say so but I am assuming the pond is 2 feet deep. In this case you have two sides 4 feet by 2 feet, two sides that are 8 feet by 2 feet and the bottom which is 4 feet by 8 feet. Hence the area of the existing pool liner is \[2(4 \times 2) + 2(8 \times 2) + 4 \times 8 \mbox{ square feet.}\] Suppose each dimension is increased by $x$ feet. Write an expression for the area required for the new liner. This is equal to twice the existing liner. Solve for $x.$ I hope this helps, 



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