Question: How could i simpify the expression p^3 q ^ -1 / q ^2 r ^ -6 using POSITIVE exponents? 

Answer: Varibles with negative exponents are the same as the varible over one. For example, x^ -2 = 1/x^2     So the solution to your problem would be:\n\np^3 r^6/q^3\n\nIt is q^3 because you can combine like terms q^1 combines with q^2 to make q^3.  If you have any questions, contact me.  Hope I was helpful.
This question from the Yahoo Q&A forum is categorized in the topic: Family & Relationships