y = 100 is the easiest function with these points.
another one is
y = (x - 2)(x - 3) + 100 = x^2 - 5·x + 106
c is the final : )
z = a+bi
the modulus is the sqrt ( a^2 +b^2)
and the argument (i call it theta) is equal to arctan (b/a)
we have z = 3-3i
we are looking for the argument of z
theta = arctan (-3/3)
= -45 degrees
they don't like negative arguments so add 360 degrees to it. it is the same value, we just loop once around the circle.