Final answer:
The subject of this question is Mathematics. The question involves calculating the probability of selecting a specific type of sports card from a mixed-up box. The probability is determined by dividing the number of cards of the desired type by the total number of cards in the box.
Step-by-step explanation:
The subject of this question is Mathematics. The question involves a scenario where Bob has sports cards of different types mixed up in a box. There are twelve baseball cards, eight football cards, and five basketball cards. The question asks about the probability of selecting a card of a specific type from the box.
To calculate the probability, we need to determine the total number of cards in the box and the number of cards of each type. Then, we can divide the number of cards of the desired type by the total number of cards in the box.
For example, if we want to find the probability of selecting a basketball card, we divide the number of basketball cards (five) by the total number of cards (twelve baseball + eight football + five basketball = twenty-five). So the probability of selecting a basketball card would be 5/25 or 1/5.