a) 0 + 7i = 7i
b) -5 + 3i
c) -3 + 0(i) = -3
d) -1 -2i
e) 1 + 7i
f) 4 -4i
Here, we want to write the coordinate points in the complex number forms
Generally, if we have a complex number, we can write it as ;

We need to identify the individual marked points in the normal coordinate form first
These are;
a) (0,7)
b) (-5,3)
c)(-3,0)
d) (-1,-2)
e) (1,7)
f) (4,-4)
So these coordinates in their corresponding complex number form will be;
a) 0 + 7i = 7i
b) -5 + 3i
c) -3 + 0(i) = -3
d) -1 -2i
e) 1 + 7i
f) 4 -4i