If $2994 \div 14.5 = 172$,then $29.94 \div 1.45 = ?$

$198.995 \times 12.005 + 16.25 \times 6.95 = ?$

If $x+y+z=1, xy+yz+zx=-1, xyz=-1,$ then $x^{3}+y^{3}+z^{3}$ is

Which of the following numbers is the greatest?

$(0.1 \times 0.01 \times 0.001 \times 10^{7})$ is equal to

What approximate value will come in place of the question mark $(?)$ in the given equation? (You are not expected to calculate the exact value)
$2775 \times \frac{160}{\sqrt{?}} = 5550$