Pre-Algebra ... again :-(
You divide the product by the quotient. So for instance, the answer for the above question will be 4. (positive 4) Since, Negative divided by negative is positive. Hope this helps.
How does Mark Twain show satire in "Experience of the McWilliamses With membranous croup & The McWilliamses And The Burglar Alarm? specific lines may help...thanks