What is the sum of this geometric series?

B. 21/2

Step-by-step explanation:

According to sigma notation we have a GP with:

The first term of 8The common ratio of 1/4

Find the sum of the first 3 terms:

Sₙ = a₁(1 - rⁿ) / (1 - r)S₃ = 8*(1 - 1/4³) / (1 - 1/4) = 8*(1 - 1/64) / (3/4) = 8*63/64 * 4/3 = 21 / 2

Correct choice is B

Ok, so first you solve whatever is in the parentheses.
(28 • 5-5 • 190)-2•228
28• 5 = 140
Then 5 •190 = 950
Then multiply 950 • 140 = 133,000
Then it should look like this:
133,000-2•228
Multiply 2 • 228 = 456
Then subtract 456 from 133,000.
The answer should come out to 132,544.