(a) let z = 2 – 3i and w=i-1. calculate the following. (i) w +z (ii) zw (iii) — " z-w [6 marks] (b) find real numbers a and b such that a + bi = (1 - 3i)", by con- verting 1- 3i into polar form and applying de moivre's theorem. [6 marks (c) calculate all complex fourth roots of i. [5 marks]

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points