Express the following in scientific notation.

The Universe is estimated to be about $12000000000$ years old _____.

Express in the usual form.

$6.023\times {10}^{19}$ molecules are there in $1.8$ gram of water. _____

Express in the usual form.

Distance between the Sun and the Earth is $1.469\times {10}^{11} \mathrm{m}$. _____

Express in the usual form.

Radius of the sun is $7\times {10}^8 \mathrm{m}$. _____

Evaluate: $\left\{{\left(\frac{-3}{4}\right)}^3-{\left(\frac{-5}{2}\right)}^3\right\}\times 4^2$

Simplify and write the result in the exponential form : $9^2+{11}^2-2^2\times 3\times {17}^0$

$a\times a\times a\times b\times b\times b\times b\times b$ is equal to

The expression ${\left(pqr\right)}^3$ is equal to