$$ 1)\:d^9d^6 = $$ $$ 2)\: \frac{c^5}{c^4} = $$ $$ 3)\: z^4 : z^9 = $$ $$ 4)\: (f^8)^4 = $$ $$ 5)\: e^8 \cdot z^8 = $$ $$ 6)\: (\frac{a}{v})^4 = $$ $$ 7)\:y^2y^7 = $$ $$ 8)\: \frac{h^3}{h^9} = $$ $$ 9)\: f^6 : f^3 = $$ $$ 10)\: (k^3)^4 = $$ $$ 11)\: c^8 \cdot y^8 = $$ $$ 12)\: (\frac{z}{x})^6 = $$