What is the numerical equivalent of the number doce?

Choose the best spanish equivalent to the phrase. they know the old salesman. conocen al vendedor viejo. saben al vendedor viejo.

My spanish teacher said this to me.. look at the ending on your verb. you need to make it agree with "yo" this is my sentence- sí yo estudiar español en la escuela how do i make it agree with "yo"

Which word best completes this sentence? en mi tengo un sótano, un salón, tres dormitorios, un altillo grande y una terraza donde puedo ver la mar. a. casa b. piso c. hall de entrada d. baño e. cocina