This problem will check your understanding of the concept
of functions. Let me remind you the definition of
Definition of a Function:
A function is a rule or correspondence which
associates to each number x in a set A a
number f(x) in a set B.
Which of the followings can not be
A. T(t)is the temperature
of hot water after time t.
B. N(x) is a person whose last name is
C. P(t) is the human population of the world
at time t
D. C(w) is the set of mailing a first-class
letter with weight w.
E. All of the above
F. None of the above
Your overall score for this problem is