What phrases can be represented by the algebraic expression 12 over w

12/w or 12 divided by w

This means division/quotient:

So... 12/w would be your answer in an algebraic expression. I'm pretty confident that 12/w is your answer. :)

Among the choices the one that  best describes her prediction is "extrapolation, because a key that is 12 keys from middle C is outside the data set". 

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