Mathematics, 10.09.2019 22:30 nothingworksoutforme

Aboardwalk that is x feet wide is built around a rectangular pond. the combined area of the pond and the boardwalk is 4x^2+140x+1200 square feet. what are the dimensions of the pond?
1. 100 ft by 60ft
2. 30ft by 40ft
3.55ft by 70 ft
4. 15ft by 80ft

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Aboardwalk that is x feet wide is built around a rectangular pond. the combined area of the pond and...