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