write each expression using a single exponent
1. a^3 * a^5 = a^(3+5) = a^8
2. x^2 * x^4 * x^6 = x^(2+4+6) = x^12
3. (b^3)^4 = b^(3*4) = b^12
4. (c^2)^5 * c^3 = c^(2*5 + 3) = c^13
5. (d^4 * d^6)^3 = d^(4+6)*3 = d^30
6. y^9 / y^4 = y^(9-4) = y^5
7. (z^5)^2 / z^3 = z^(2*5 - 3) = z^7
8. (x^3 * y^4)^3 = x^(3*3) * y^(4*3) = x^9 * y^12