What is the value of ${\left(-2\right)}^3$?

What is the value of: 

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

What is the value of: ${\left(5\times 3\right)}^{-2}$

Find the value of: $(6^0\times 5^0)÷\left(8^0+3^0\right)$.

If ${\left(\frac{-3}{4}\right)}^{3x}={\left(\frac{-3}{4}\right)}^{12}$, then $x$ equals to:

What is the value of $29,75,200$ in standard form?

What is the value of $0.00507$ in standard form.

Simplify:

${\left(\frac{10}{19}\right)}^{-2}$