The vertices of a quadrilateral lie on the graph of $y = \ln x$, and the $x$-coordinates of these vertices are consecutive positive integers. The area of the quadrilateral is $\ln \frac{91}{90}$. What is the $x$-coordinate of the leftmost vertex?

Which number is larger: $5^{4321}$ or $4^{5321}$?

Compute $\sqrt[32]{259\times 23\times 11 +9}$.

Simplify: $\left(\frac{1-\sqrt{5}}{2}\right)^{12}$.