What is the equation used to find the effective thickness of the exist

1.	What is the equation used to find the effective thickness of the existing pavement?
A.	(h_e= _{i=1}^n C_i )
B.	(h_e= _{i=0}^n h_i C_i )
C.	(h_e= _{i=1}^n h_i )
D.	(h_e= _{i=1}^n h_i C_i )
Answer» E.

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What is the equation used to find the effective thickness of the existing pavement?

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