Answer: B) -56i - 24
This is the same as -24 - 56i
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Explanation:
The 'i' refers to the imaginary number 
In other words, 
Squaring both sides gets us 
So,

The result is in the form a+bi where a = -24 is the real part and b = -56 is the imaginary part.
Which of the following is the correct way to write seventy million as a numeral?
As I see no choices the right way to write seventy million as a numeral is

Hope I helped!
When you don't know the answer on a multiple-choice questions it is generally best to guess a random answer instead of leaving it blank.
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An alternating series

converges if

is monotonic and

as

. Here

.
Let

. Then

, which is positive for all

, so

is monotonically increasing for

. This would mean

must be a monotonically decreasing sequence over the same interval, and so must

.
Because

is monotonically increasing, but will still always be positive, it follows that

as

.
So,

converges.