well, 31/2 is in simplified form
the mixed number form is 15 1/2
and the decimal form would be 15.5
15 of them are green.
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.