Final answer:
The revenue of the tile factory, which includes a flat fee plus the sale price per tile, is represented by the equation: Revenue = 0.25x + 3000 (option d), where 'x' is the number of tiles sold.
Step-by-step explanation:
The equation that describes the revenue of the tile factory in terms of tiles sold (x) includes the sale price per tile and a flat delivery fee. Given that the factory shipped 10,000 units at a rate of $0.25 per tile and the total revenue from the sale was $3000, the correct equation factors both the flat fee and the price per tile.
The formula for calculating revenue in this case would be the flat fee plus the product of the number of tiles sold (x) and the sale price per tile.
Thus, the correct equation is:
Revenue = 0.25x + 3000
This equation accounts for the initial $3000 in revenue regardless of the number of tiles sold and adds 25 cents for each tile sold thereafter. Since the flat fee is added to the revenue generated by the sale of tiles, we use addition in the formula.