The difference between the local extreme values of the function $f(x) = 2x^3 - 15x^2 + 36x + 40$ is ......

A wire of length $64$ m is to be bent to form a rectangle such that its area is maximum, then its area is.....

The approximate value of $\sqrt[3]{63}$ is

The equation of the tangent to the curve $y = 3x^3 - 3x^2 + x$ at $x = 1$ is