Final answer:
The stack of index cards is 10 inches tall and each card is 0.1 inches thick. There are 100 index cards in the stack.
Step-by-step explanation:
The stack of index cards is 10 inches tall and each card is 0.1 inches thick. To find the number of index cards, we need to divide the total height of the stack by the thickness of each card.
Number of index cards = Total height of the stack / Thickness of each card
Number of index cards = 10 inches / 0.1 inches = 100 cards
Therefore, there are 100 index cards in the stack.