Exercise 1:
The easiest way to compute powers of complex numbers is to write them in the form

In this form, you have

The magnitude of the number is given by

So, we have

As for the angle, we have

So, we have

Finally,

Exercise 2:
You simply have to compute the trigonometric function:

So, we have

I think its d but you cant see all of the question.<span />
0.6=k
This is your answer because the equation is for direct variation is y=kx
You substitute the numbers
The answer is I think b because it has x-50 and it said Andrew sold less that Sarah so its subtracting
Step-by-step explanation:
22+2x+8= x+20
2x+30=x+20
x+30=20
x=-10
answer is -10