A lady in the class.
Hay una mujer means: "There is a woman"
es una clase de matematicas means is a kind of mathematics
It means "it is one" referring to a feminine noun, e.g. es una mujer = it's a woman.
A Small class
Unas clases
Is there a computer in your class?
It means "You are a classmate".
Translation: You are a beautiful/gorgeous woman.
Una Mujer was created in 2003-03.
"Siendo una mujer buena" means "being a good woman" in Spanish.
Busca una mujer was created in 1987.
Sólo Una Mujer was created in 1984.