A 12-ft-by-15-ft rectangular swimming pool has a 3-ft-wide no-slip surface around it. What is the outer perimeter of the no-slip surface? A. 78 ft B. 78 ft^2 C. 198 ft D. 198 ft^2

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A 12-ft-by-15-ft rectangular swimming pool has a 3-ft-wide no-slip surface around it. What is the outer perimeter of the no-slip surface? A. 78 ft B. 78 ft^2 C. 198 ft D. 198 ft^2

Geometry
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You have to first add 3 to the legth and Width, what do you get?
Would it be 15-ft-by-18-ft or 18-ft-by-21-ft?
it would be 15 by 18

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then you have to add 3 more because of the other side, so 18 by 21
That makes sense, thanks for the quick reply :)
No problem! Good luck with your math
A. \[2 ((12+6)+(15+6))=78 \]
78 is the no-slip surface perimeter as requested in the problem statement.

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