Which of the following days fall during the normal school or work week? (Check all that apply) 1. lunes
2. Viernes
3. Domingo
4. sábado

i know for normal school days it Monday Tuesday Wednesday Thursday and Friday so Your answer has to be Lunes y Viernes  

Explanation:

Spanish is my native language but since i lived in the U.S since i was born i know this because of kindergarten

ah, so ustedes and nosotros are my 'go-to' if i am using spanish mainly in the states? interesting, but still slightly confusing, haha."

it seems that you are a little confused about subject pronouns. yo=i, tú/usted=you, nosotros=we, ustedes=you(plural), ellos/ellas=they.

in the case of vosotros, it is an informal replacement for "ustedes" in spain. similar to using "you all" in english.

even though it is not generally used in conversation outside of spain, it is used many times in literature. i would suggest having at least some familiarity to that form, at least to recognize what it is.