Answer:
1. Igualmente
2. Buenas noches
3. Hasta mañana
Step-by-step explanation:
"Igualmente" is used as a way to say "same to you" and it is commonly used in Latin American countries.
Simply saying "buenas noches" back would be like saying goodnight back and that is a logical way to respond
"Hasta mañana" translates to "until tomorrow" and is another commonly used phrase in Spanish speaking countries as a response to good night.