SOLUTION: The area of the surface of the swimming pool is 210 square feet. The width is 10 ft. and the length is 9 + d ft. What is the length d?

Algebra ->  Equations -> SOLUTION: The area of the surface of the swimming pool is 210 square feet. The width is 10 ft. and the length is 9 + d ft. What is the length d?      Log On


   

Question 989701: The area of the surface of the swimming pool is 210 square feet. The width is 10 ft. and the length is 9 + d ft. What is the length d?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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L=length; W=width; A=area
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A=LW
210=(9+d)(10)
21=9+d
12=d
ANSWER: d=12 feet