What does the structure 'ir+a+infinitive' express in Spanish?

Which of the following sentences correctly uses 'ir+a+infinitive'?

Which sentence means 'We are going to eat' using 'ir+a+infinitive'?

What is the correct way to say 'She is going to travel' in Spanish using 'ir+a+infinitive'?

How do you express 'They are going to play soccer' in Spanish using 'ir+a+infinitive'?

Which of the following translates to 'I am going to read a book' using 'ir+a+infinitive'?

Which sentence correctly uses 'ir+a+infinitive' to express a future action?

What does 'Nosotros vamos a estudiar' mean in English?

Which of the following sentences correctly expresses the future action 'You (formal) are going to visit the museum' using 'ir+a+infinitive'?

Which sentence means 'We are going to watch a movie' using 'ir+a+infinitive'?