Respuesta :

ronhagrid310

Answer:

Here, we have BC // ST, by applying Thales theorem:

UB/US = UC/UT

=>UB = UC x US/UT =6 x 12/(6 + 18) = 3

=> x = US - UB = 12 - 3 = 9

=> Option C is correct.

Hope this helps!

:)

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