Sorry my links aren't working I don't know why
The answer is 7i because if you add 4+3i together as an absolute value, it equals to 7 plus the i is 7i
The partial products are 4x80 and that's all because in the ones it has no actual digit
you have to make sure that they have the same denominator so
31/4 -4 2/4
= - 1 1/4
hope this helped you hon
Nope. Your problem is not irrational