Final answer:
Out of the given cards, only one card has a value greater than 12.
Step-by-step explanation:
To determine how many cards in Dale's special deck have a value greater than 12, we need to compare each card's value to 12. We have the following cards: 0.25, 45, 29, 0.48, and 811. Only the card with a value of 811 is greater than 12. Therefore, one card has a value greater than 12.