PLEASE HELP FAST!! Wally collects 15 baseball cards each week. He gave 10 cards to his friend James. Wright an expression to show the number of cards that sally has left.
15x - 10 where x is equal to the number of weeks would respresent the situation above. This is because he gains 15 cards every week and gave ten cards to James once.
If it has only been one week, the expression will be 15 - 10 because 15 × 1 = 15.
