# Write an expression for the length of an open polyline ABCD, if AB = x cm, BC is 12.71

September 14, 2021 | education

| **Write an expression for the length of an open polyline ABCD, if AB = x cm, BC is 12.71 cm less, and CD is 2.85 dm larger than AB, and simplify it.**

12.71 cm = 1.271 dm

AB + BC + CD = x + (x – 1.271) + (x + 2.85) = 3x + 1.579 (dm).

Answer: 3x + 1.579 dm.

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