Question

Erica has 4 fewer CDs than Kim. Write this situation as an algebraic expression

Answer 1

First we have to give names to the quantities that each lady has.

Number of CDs that Erica has = E

Number of CDs that Kim has = K

The algebraic expression (actually an equation):

               E = K - 4

Answer 2

$E\ \rightarrow\ the\ number\ CDs\ of\ Erica\\\\K\ \rightarrow\ the\ number\ CDs\ of\ Kim\\\\E=K-4$