Answer:
11. ¿Cuánto es la camisa?
12. Hola Juan. ¿Cómo estas? Bien, Gracias
Answer:
Los abrigos blancos.
Explanation:
in grammatical accidents the number indicates the number of individuals that the noun speaks of, in this case it is speaking of more than one, therefore it must be combined in a plural way so that it has agreement with what is being expressed.
If it refers to a single individual, the singular number should be used.