Final answer:
To calculate the total baseball cards Jordan has, multiply the number of piles (3) by the number of cards per pile (15), equaling 45 baseball cards in total.
Step-by-step explanation:
Jordan has 3 piles of baseball cards with 15 cards in each pile. To find the total number of baseball cards Jordan has altogether, we need to multiply the number of piles by the number of cards in each pile. The calculation is as follows:
- Number of piles: 3
- Cards per pile: 15
- Total cards: 3 piles × 15 cards per pile = 45 baseball cards
Therefore, Jordan has 45 baseball cards altogether. The correct answer is (d) 45 baseball cards.