I believe the answer should be 77
ANSWER

EXPLANATION
The complex number shown has coordinates (2,-2)
or

The modulus is


The argument is


The polar form is

The first option is correct.
1=7 3=21 5=35 7=49 13=91 hope this helps :)
Hello from MrBillDoesMath!
Answer: 5n - 2
where "n" is the number mentioned in the problem statement
Thank you,
MrB
9 and 3 are the only common factors between 54 and 90