Is the signal x(n) = u(n + 4) – u(n – 4) causal?

What is the Laplace transform of t³e^-3t?

The shape of the function f(t) = r(t) - r(t-1) - r(t-2) + r(t+3) is:

u(n+2)u(-n+3) is equal to

An energy signal auto-correlation function has

The system y(n) = x(n) - x(n-1) is

Impulse response is the output of ______ system due to impulse input applied at time=0.

When a signal is defined continuously for any value of an independent variable, is called ________.

If x(n) tends to infinity or constant,as "n" tends to infinity , then y(n)=n x(n) will be infinite as "n" tends to infinity. So the system is________

The continuous time system described by the equation y(t) = x(t²) comes under which category?