$$ 1)\:z^4z^8 = $$ $$ 2)\: \frac{q^6}{q^7} = $$ $$ 3)\: t^4 : t^9 = $$ $$ 4)\: (v^3)^6 = $$ $$ 5)\: b^9 \cdot v^9 = $$ $$ 6)\: (\frac{v}{x})^9 = $$ $$ 7)\:y^3y^7 = $$ $$ 8)\: \frac{q^6}{q^8} = $$ $$ 9)\: v^7 : v^4 = $$ $$ 10)\: (d^7)^7 = $$ $$ 11)\: m^8 \cdot z^8 = $$ $$ 12)\: (\frac{x}{y})^6 = $$