Nathan has a $5 gift card to download Pokemon games. The function m = -0.5d + 5 represents the amount of money m that remains on the card
after a certain number of games, d, are downloaded. Find the zero and
explain what it means.*

Nathan can download 9 games and have some money left on the card

Nathan can download 10 games and have $0 left on the card

Nathan can download 15 games and have some money left on the card

Nathan can download 20 games and have $0 left on the card