Venga a nuestra casa is used for someone who should respect or who is elderly so this would be the right choice.
Ven a nuestra casa would be used to refer to maybe your close friends or people you can be casual with :)
Answer:
Questions:
Hola cómo estas?
Cual es tu nombre y de donde vienes?
Que haces para divertirte?
Cual es tu favorita materia y porque?
Cual es la materia mas dificil para usted?
Response to one of the questions:
Mi nombre es Jose y vengo de Guatemala.
calculates the concentration of hydronium in acid rain if the pH is 4.35
Mis maestros necesitan papel.
Again, similar to the previous question, since this is third person plural (they), you would use the verb form ending in -n, such as necesitan, since that is the plural form.
Necesitamos is used for we.
Necesito is used for I.
Necesitais is used for you, plural.
