There are 
ways of building a subset of 
elements from 
, so the total number of subsets you can build is
Recalling the binomial theorem, the above sum is equal to
as required.
Answer:
B
Step-by-step explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius
To obtain this form use the method of completing the square
Given
x² - 8x + y² - 2y - 8 = 0 ( add 8 to both sides )
x² - 8x + y² - 2y = 8
add ( half the coefficient of the x/y terms )² to both sides
x² + 2(- 4)x + 16 + y² + 2(- 1)y + 1 = 8 + 16 + 1
(x - 4)² + (y - 1)² = 25 → B
I suck at math but here's a site that will help you just add the decimal afterwords.http://www.calculatorsoup.com/calculators/math/longdivision.php
X will be 35 but idk the formula
