The maximum value of $\frac{\log x}{x}$ is

Derivative of $\mathrm{e}^x$ w.r.t. $\sqrt{x}$ is

The curve satisfying the differential equation $y \mathrm{~d} x-\left(x+3 y^2\right) \mathrm{dy}=0$ and passing through the point $(1,1)$ also passes through the point

The maximum value of $z=x+y$, subjected to $x+y \leq 10,5 x+3 y \geq 15, x \leq 6, x, y \geq 0$