What is the condition called when the heart rate decreases below the normal range?

If $\alpha, \beta$ and $\gamma$ are the roots of the equation $x^3+p x^2+q x+r=0$,then the coefficient of $x$ in the cubic equation whose roots are $\alpha(\beta+\gamma), \beta(\gamma+\alpha)$ and $\gamma(\alpha+\beta)$ is

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide?

One of the constituents of the pancreatic juice while poured into the duodenum in humans is

The function $f(x) = x e^{-x}, \forall x \in R$ attains a maximum value at $x$ equal to

When a wave travels in a medium,the particle displacement is given by: $y = a \sin 2\pi (bt - cx)$,where $a, b$,and $c$ are constants. The maximum particle velocity will be twice the wave velocity if