yesterday, lena had 55 baseball cards. Today she gave c away. using c write an expression for the number of cards lena has left.
55 - c
To write an expression for the number of cards Lena has left after giving away "c" cards, we need to subtract the number of cards given away from the initial number of cards Lena had.
Let's assume the initial number of cards Lena had is represented by the variable "n".
So, Lena had "n" cards, and she gave away "c" cards. The expression for the number of cards Lena has left is:
n - c
Substituting the given information:
Lena initially had 55 baseball cards, so n = 55.
She gave away "c" cards.
The expression for the number of cards Lena has left can be written as:
55 - c