Answer:
See proof below
Step-by-step explanation:
Let . If w=-z, then r=0 and r is real. Suppose that w≠-z, that is, r≠0.
Remember this useful identity: if x is a complex number then where is the conjugate of x.
Now, using the properties of the conjugate (the conjugate of the sum(product) of two numbers is the sum(product) of the conjugates):
=
Thus . From this, . A complex number is real if and only if it is equal to its conjugate, therefore r is real.
Answer:
range: 14
Step-by-step explanation:
Subtract the lowest score from the highest: 9 - (-5) = 14
Answer:
35%/5 = 7 b=7 7 + 35x7= 966 / 21 = 46
Step-by-step explanation:
Answer:
Step-by-step explanation:
Expand:
Subtract 14 from both sides:
Subtract 6x from both sides:
834.39 is the answer because you take .27 and add 1 since its an increase since your working backwards to find the answer and when you get 1.27 you times that by the discounted price of 657.00 to get 834.39