Using the laws of exponents, simplify and write the answer in the exponential form:

$2^3\times 2^5$

Using the laws of exponents, simplify and write the answer in the exponential form:

$3^4\times 3^5\times 3^6$

Using the laws of exponents, simplify and write the answer in the exponential form:

$7^{12}÷7^5$

Using the laws of exponents, simplify and write the answer in the exponential form:

${\left(9^2\right)}^3$

Using the laws of exponents, simplify and write the answer in the exponential form:

${\left(6^2\right)}^5÷6^9$

Using the laws of exponents, simplify and write the answer in the exponential form:

$4^8\times 4^9$

Using the laws of exponents, simplify and write the answer in the exponential form:

$\frac{3^{15}}{3^8\times 3^3}$

Using the laws of exponents, simplify and write the answer in the exponential form:

${\left(6^7\times 6^3\right)}^4$

Using the laws of exponents, simplify and write the answer in the exponential form:

$\left[{\left(5^3\right)}^4\times 5^8\right]÷5^{15}$