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

(i) $3^2\times 3^4\times 3^8$ (ii) $6^{15}÷6^{10}$ (iii) $a^3\times a^2$ (iv) $7^x\times 7^2$ (v) ${\left(5^2\right)}^3÷5^3$ (vi) $2^5\times 5^5$ (vii) $a^4\times b^4$ 

(viii) ${\left(3^4\right)}^3$ (ix) $\left(2^{20}÷2^{15}\right)\times 2^3$ (x) $8^t÷8^2$

(i) Using the law of multiplying powers with the same base: $a^m\times a^n=a^{m+n}$

Hence, the exponential form: $3^2\times 3^4\times 3^8=3^{2+4+8}=3^{14}$

(ii) Using the law of dividing powers with the same base: $a^m÷a^n=a^{m-n}$

Hence, the exponential form: $6^{15}÷6^{10}=6^{15-10}=6^5$

(iii) Using the law of multiplying powers with the same base: $a^m\times a^n=a^{m+n}$

Hence, the exponential form: $a^3\times a^2=a^{3+2}=a^5$