convert rectangularform complex numbers to polar form C 5 j

convert rectangularform complex numbers to polar form:

C= -5 + j7

C= 4 - j2

convert rectangular form complex to polar form:

C = -2 - j7

C = 12.6 - j31.7

convert polar form to complex form

C= 12e^(j15 degree)

C = 12e^( -j15 degree)

rewrite polar form complex numbers in conventional form

C= -5e^( -j35 degree)

please show the steps