Answer:
Yes it can be used in a sentence correctly but it is not very normal or used, much.
Answer:
Hello! Your answer would be D) What.
Explanation:
A direct object receives the action done by the subject. It can be a noun, pronoun, phrase, or clause. A direct object can be identified by asking the “what” (or “whom”) question using the subject and verb of the sentence.
Answer: qué es la pregunta
Explanation:
por favor márcame como mentalmente
Answer:
x ∈ R(0=0)
Explanation:
Se la expresión 

La posición es verdadera para cualquier valor de X.