Answer:
The correct answers are:
1) Mariana y Esteban fueron al zoológico, ¿no?
In this case, because Mariana and Esteban are two people, the correct conjugation of the IR verb in the past is FUERON.
2) Elena y Juanita fueron al cine.
As in the previous case, the conjugation corresponding to the pronoun They (ELLOS/ELLAS) in the past is FUERON.
3) Ayer yo fui al hotel.
In this case, we only have one person: I (YO). The conjugation of the IR verb suitable for the pronoun YO in the past is FUI.
4)Yo fui a la casa de mi amiga.
The same happens here as in the previous case.
5) ¿Adónde fue ella?
The pronoun used here is she (ELLA), therefore the correct form of the verb IR in the past is FUE.
6) (Tú) Fuiste a la discoteca mañana. --- FALSE.
You cannot use the adverb tomorrow with a verb that is in the past. The correct thing would be to use the adverb of time AYER.
8) Lavo los platos en la lavadora.--- FALSE.
In a lavadora you can wash clothes. The right thing would be to wash the dishes in a lavaplatos.
9)Jorge y Manuel plancharon la ropa.
PLANCHARON is the corresponding verb for Jorge and Manuel that is in the past. His translation would be Jorge and Manuel ironed the clothes.
10)Ayer, yo planché la ropa.
In this case, as the person is Yo, the correct conjugation in the past is PLANCHÉ.