The function $$f(x)=x^2-2 x$$ is strictly decreasing in the interval

The maximum slope of the curve $$y=-x^3+3 x^2+2 x-27$$ is

If the curves $$2 x=y^2$$ and $$2 x y=K$$ intersect perpendicularly, then the value of $$K^2$$ is

If the side of a cube is increased by $$5 \%$$, then the surface area of a cube is increased by