Question

use sum of a geometric series to find the sum of the first 10 terms of this sequence an=27(0.1)^(n-1)

Answer 1

30

Answer 2

\[27\times \frac{1-.1^{10}}{1-.1}\]

Answer 3

How did you use sum of a geometric series @PROSS

Answer 4

which is fact is almost exactly 30

Answer 5

ignore the
\[.1^{10}=.0000000001\] and you get
\[27\times \frac{1}{.9}=27\times \frac{1}{\frac{9}{10}}=27\times \frac{10}{9}=30\]

Answer 6

use the formula saellite73 gives for an analytic approach.
You can check your answer with a calculator....
sum(seq(Y1,x,1,10))
Where Y1=27(0.1)^(x-1)