Ustedes estudian en la biblioteca is the correct answer.
Spanish has verb suffixes for each pronoun, which is something English only has for third person singular (-s, or -es). So, this is how to conjugate the verb estudirar (=to study):
1. yo estudio 1. nosotros estudiamos
2. tu estudias 2. vosotros estudiais
3. el/ella/Usted estudia 3. ellos/ellas/Ustedes estudian
Answer: escribe es el verbo
Explanation:
It is 127.5 million so I would say approximately 124 million since it's the closest to it.
Mi familia y yo miramos la televisión
Your answer is the third one