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

Answer:
Step-by-step explanation:
(2/5)x + 9 = 9 is equivalent to (2/5)x = 0
"Nine more than two-fifths of a number is nine" is correct.
The answer is thirteen
1 cup=4 one fourths
3 cups=12 one fourths
Add one more one fourth
Answer:
Option B. After 20 minutes, Shari had 6 kilometers left to run
Step-by-step explanation:
Let
x ----> the time in minutes
y ----> the distance remaining in kilometers
we have the ordered pair (20,6)
That means
x=20 min
y=6 km
so
After 20 minutes, Shari had 6 kilometers left to run
X=12, -9 I hope this somewhat helps you :)