Final answer:
Adrian can deduct a loss of $6,880 on her year 4 tax return.
Step-by-step explanation:
Loss on Stock Sale
To calculate the loss that Adrian can deduct on her year 4 tax return, we need to find the difference between the purchase price and the sale price of the stock. In this case, Adrian purchased 430 shares for $70,950 three years ago and sold them for $64,070 in year 4. The loss can be calculated as follows:
Loss = Purchase Price - Sale Price
Loss = $70,950 - $64,070 = $-6,880
Therefore, Adrian is able to deduct a loss of $6,880 on her year 4 tax return.