$$ 1)\:s^4s^9 = $$ $$ 2)\: \frac{x^9}{x^5} = $$ $$ 3)\: m^9 : m^7 = $$ $$ 4)\: (m^5)^9 = $$ $$ 5)\: k^8 \cdot h^8 = $$ $$ 6)\: (\frac{e}{c})^3 = $$ $$ 7)\:k^5k^3 = $$ $$ 8)\: \frac{x^7}{x^8} = $$ $$ 9)\: y^6 : y^8 = $$ $$ 10)\: (t^4)^8 = $$ $$ 11)\: b^9 \cdot z^9 = $$ $$ 12)\: (\frac{p}{n})^2 = $$