Basically another way of saying see you later or see you soon😊

Ellas Hace referencia a mas de 1 mujer. "Ellas salieron corriendo"(she in plural form) Ellos hace referencia a más de 1 hombre." Ellos no quieren jugar" (He in plural form) just in Español.

facilitate と hasten と accelerate と expedite はどう違いますか？説明が難しい場合は、例文を教えて下さい。

what is the plural of "day-off"? days-off or day-offs?

They are basically the same. Egoistic is more about being selfish while egotistic is more about being more important than everyone, I would say.