Debra wants to save 500$ to buy a tv. She saves $18 each week. The amount, a (in dollars) that she still needs after W weeks is given by the following function.

Last month, leonhard euler's watch kiosk at the mall had total sales of $9,489. merchandise totaling $225 was returned. the goods that were sold cost leonhard euler's $5,481. operating expenses for the moth were $992. what was the gross profit on sales?