Question

Yesterday, Ali had n baseball cards. Today, he gave 6 away. Using n, write an expression for the number of cards All has left.

Answer 1

$n-6$

1) Calling "n" the unknown number of cards, and considering that Ali has given 6 baseball cards away.

2) We can write this out, in terms of "n"

$n-6$

Since we are allowed only to write it in terms of "n", then we can stop right here.