Find the sum of a geometric series.
20 - 5 + 5/4 - 5/16 + ...
A) 220/7
B) 16
C) 286/13
D) 66

Option B.

Step-by-step explanation:

Consider the given geometric series is

We need to find the sum of given series.

Here, first term is a=20 and common ratio is

The sum of infinite GP is

Substitute .

Therefore, the correct option is B.

sup

step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.