Depends on context but it is some form of the word Alquilar (to rent)
A rental car = Automobil/Coche/carro alquilado
A rental unit = Apartamendo de alquiler
Don't worry, it's a rental = no te preocupes, es alquilado
The Spanish term is "raíz cuadrada."
Believe it or not, the Spanish have now adopted the term "Chatear".
Verde is the Spanish term for "green".
Zapatos de ballet is the Spanish term for ballet shoes.
Cuántos tiempo...
There may be a local idiomatic term, but in Spanish it is "sofá" or possibly "sillon".
In Spanish the term is "Happy Nativity" = Feliz Navidad
Botín is the word used for the real English word "swag," not the slang term. What you want is the Spanish slang term "bulto."
To say 'bag' in Spanish, you will say 'mochila'. This only applies for school bag. The general term for "bag" would be "bolsa".
Suegra is the Spanish term for "Mother-in-law"
Pelo largo.
camisa larga