Tu eres de El Salvador?
Mi papá es abogado
No somos salvadoreños
Ellas no son de Santa Ana
Anna está en la playa el zonte
Estás tú en casa?
(I’m not quite sure though since I speak Mexican Spanish)
Answer:
x ∈ R(0=0)
Explanation:
Se la expresión 

La posición es verdadera para cualquier valor de X.
Answer:
Estás delante del sofá.
Explanation:
The question tells you that YOU are Lucia. So, you would use "you" instead of "she", so use estás instead of está.
She is not next to a door, so she is not "al lado de la puerta". She is in front of the sofa, so she is "delante del sofa".
Eres Lucía; estás delante del sofá.
Hope this helps!