Hey, can you plz help me answer this!
2 answers:
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Answer:
<em>summation of five times negative three to the power of n from n equals zero to infinity</em>
Step-by-step explanation:
<u>Summation Notation </u>
It represents the sum of a finite or infinite number of terms. Let's analyze the terms of the given succession:
5-15+45-135+...
If we take 5 as a common factor, we have
5(1-3+9-27+...)
The parentheses contain the alternate sum/subtraction of powers of 3. The odd terms are positive, the even terms are negative, thus the exponent must be n starting from 0 or n-1 starting from 1
The summation is then represented by
This corresponds with the option:
<u>summation of five times negative three to the power of n from n equals zero to infinity</u>
Answer:
and
Step-by-step explanation:
The given ellipse has equation:
.
The center of this ellipse is (h,k)=(0,2)
We use the equation: to determine the foci.
The directrices are given by
and
The equation of the directrices are:
and
The correct answer is D