The first one:
A las tres, Pepe hablo con su novia por teléfono.
The second one doesn’t make much sense, it would be saying: I bought some black pants and my friend Mateo like a lot of money.
I added words in parentheses to make it make more sense:
Yo compré unos pantalones negros y (a) mi amigo mateo le gusta mucho (el) dinero.
The third one:
Después, nosotros comimos cerca de un mercado.
The correct answer would be: Cuando _X_ lavo el coche, no uso detergente.
Good luck!
For #3 you could put La gente en el centro comercial nos entiende. (The people at the mall understand us.)
I don't know about #4 sorry.
But hopefully this helps
Answer:
It is the product of 3 and 1/4.
which means 3 is an integer.
