Respuesta :

Answer:

C

Step-by-step explanation:

Since B is the midpoint of AC then

BC = AB, that is

2x - 11 = x + 5 ( subtract x from both sides )

x - 11 = 5 ( add 11 to both sides )

x = 16

Hence

AB = x + 5 = 16 + 5 = 21 → C

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