A retail associate is processing a customer return. To change the original purchase price $P$ into a refund amount, the associate's software multiplies the price by $-1$. According to the mathematical property of multiplication by $-1$, what is the simplified result of this calculation?

A logistics coordinator uses an inventory spreadsheet to track outgoing shipments. To represent the removal of items from stock, the coordinator multiplies the shipment quantity, $q$, by ${}-1$. According to the mathematical property of multiplication by ${}-1$, the simplified algebraic result of the expression ${}-1q$ is ____.

Match each expression involving the property of multiplication by $-1$ with its simplified result.

Inventory Adjustment Formula

An accounting associate is writing a spreadsheet formula to reverse an overcharge amount, $a$. According to the property of multiplication, multiplying the amount by ${}-1$ yields the reciprocal of that amount.