Chapter 5 - Section 5.2 - Negative Exponents and Scientific Notation - Exercise Set - Page 354: 60

$\dfrac{-15r^{-6}s}{5r^{-4}s^{-3}}=\dfrac{-3s^{4}}{r^{2}}$

$\dfrac{-15r^{-6}s}{5r^{-4}s^{-3}}$ Evaluate the division: $\dfrac{-15r^{-6}s}{5r^{-4}s^{-3}}=\Big(\dfrac{-15}{5}\Big)r^{-6-(-4)}s^{1-(-3)}=-3r^{-2}s^{4}=...$ Simplify: $...=\dfrac{-3s^{4}}{r^{2}}$