Find the value of: `frac{i+i^7+i^8+i^9}{i^2+i^3}`

Find the value of: i+ i^2 + i^3 + i^4

Find the value of (i^6 + i^7 + i^8 + i^9) / (i^2 + i^3)

Find the value of: i^49 + i^68 + i^89 + i^110

frac{i^6+i^7+i^8+i^9}{-1+i} =

Find the value of: 1+ i^2 + i^4 + i^6 + i^8 +............+ i^20

Express the following in the form of (a+ib), a,b in R, i= sqrt (-1) State the values of a and b: frac{4i^8-3i^9+3}{3i^11-4i^10-2}