Question

1 determine a soma S=i+i2+i3+i4+...+i306
2 (-7i)2     /   (3i)2
3 i 1.000     / i 235  

Answer 1

1) soma Pa
Sn=n(a1+an)/2
Sn=306(1+306)/2=46971i

2)(-7i)2/(3i)2=-14i/6i
=>-14i*(-6i)/6i*(-6i)=-84/36=-7/3

3) i 1.000/i 235  
===> i1000*(-i235)/i235*(-i235)=235000/55225=4,2