1. For each of the following systems, determine with justification whether the system is

i memoryless

ii causal

iii stable

iv linear

v time-invarient

1 2

6

(b) y(t) =

dx(t)

dt

(c) y[n] nx[-n] +5

(d) y(t) = [1 + cos(25nt)] r(t)

(a) y[n]:

=

Σ_r\n - k]

k=-2