Can somebody please help me with this one I'm begging I will thank you and make the brainliest. :)
40 POINTTTTS!!!! ASAP

Answer:
B
Step-by-step explanation:
SUR and TUS will be similar figures
SU/TU = RU/SU
h/12 = (42-12)/h
h/12 = 30/h
h² = 30×12
h²= 360
h = sqrt(360) = sqrt(36×10)
h = sqrt(6²)×sqrt(10) = 6sqrt(10)