Question

yesterday, keiko had 121 baseball cards. today, she gave c away. using c, write an expression for the number of cards keiko has left.

Explanation:

Step1: Identify initial amount

Initial number of cards is 121.

Step2: Subtract given - away amount

Subtract $c$ from 121 to get remaining cards. So the expression is $121 - c$.

Answer:

$121 - c$