$$ 1)\:d^9d^5 = $$ $$ 2)\: \frac{s^7}{s^5} = $$ $$ 3)\: c^4 : c^6 = $$ $$ 4)\: (s^6)^3 = $$ $$ 5)\: a^2 \cdot k^2 = $$ $$ 6)\: (\frac{n}{y})^7 = $$ $$ 7)\:k^4k^9 = $$ $$ 8)\: \frac{q^6}{q^3} = $$ $$ 9)\: k^5 : k^2 = $$ $$ 10)\: (e^4)^2 = $$ $$ 11)\: n^4 \cdot d^4 = $$ $$ 12)\: (\frac{b}{q})^7 = $$