a.  Explain why the "vertical line test" can be used to
    check if a graph can represent a function.



b.  Explain why the following ordered-pairs cannot represent a function.
    (0, -1)   (-1, 0)   (0, 1)   (1, -1)   (0, -1)



c.  Explain why the following ordered-pairs can represent a linear function.
    (-2, 0)   (0, 5)   (2, 10)   (4, 15)   (6, 20)



d.  Record the domain for the function:  f(n) = 10 / ((n + 2)(n - 5)(n + 3))



e.  Given f(i) = 2(i)^3 + 2(i)^2 + 2(i)^1 + 2(i)^0,  f(3) = ______

f.  Given f(j) = 8(j) + 3(j) + (j) - 10,  j = _____ when f(j) = 10

h.  Find the equation of a line that passes through the point (-1, 3)
    that is perpendicular to the line  y = (1/4)x + 2




Answer the remaining questions using the following ordered-pairs:
(4, 0)   (2, 10)   (0, 20)   (-2, 30)   (-4, 40)

g.  Record the horizonal-intercept.  __________

h.  Record the vertical-intercept.  __________

i.  Record the slope.  __________

j.  The ordered-pairs represent a (increasing | decreasing) function.