Rational Expressions and Equations, assignment help

Hello, I am trying to help my son with his online Algebra II class.  It has been many years since I have done this, and I am stumped.

for the function, f(x)=5/x^2

a) Complete the table of values

b) Draw the function on the coordinate plane

c) Write the domain and range of the function using set notation

  x   -4    -3    -2    -1    0    1    2    3    4

f(x)  _     _     _      _    _    _    _    _    _

What?????  I am completely lost.  I have no clue where to start helping him understand what he needs to do.