Complex Numbers Argand Diagram Transformations

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Q1a. If z is multiplied by pure imaginary number i, then its effect of the Argand diagram is:
a. 90 counter-clockwise rotation
b. 90 clockwise rotation
c. Reflection on the x-axis
d. Reflection of the y-axis

Q1b. If z is multiplied by pure imaginary number i15, then its effect of the Argand diagram is:

a. 90 counter-clockwise rotation
b. 90 clockwise rotation
c. 180 rotation
d. No change in position

Q1c. What is true about the complex number z and its conjugate .
a. is 90 counter-clockwise rotation of z

b. is 90 clockwise rotation of z

c. is reflection of z on the x-axis

d. is reflection of z on the y-axis

Q1d. Reciprocal of a complex number, z, is along
a. 90 counter-clockwise rotation of z
b. 90 clockwise rotation of z
c. reflection of z on the x-axis
d. reflection of z on the y-axis