9514 1404 393
Answer:
(9n +10^(-n) -1)/27
Step-by-step explanation:
The tricky part is figuring out how to describe the series. The general term can be described by ...
an = (1/3)(1 -10^(-n))
Then the sum of n terms is ...
![\displaystyle\sum_{k=1}^n{\frac{1-10^{-k}}{3}}=\frac{n}{3}-\frac{1-10^{-n}}{30(1-10^{-1})}=\boxed{\frac{9n+10^{-n}-1}{27}}](https://tex.z-dn.net/?f=%5Cdisplaystyle%5Csum_%7Bk%3D1%7D%5En%7B%5Cfrac%7B1-10%5E%7B-k%7D%7D%7B3%7D%7D%3D%5Cfrac%7Bn%7D%7B3%7D-%5Cfrac%7B1-10%5E%7B-n%7D%7D%7B30%281-10%5E%7B-1%7D%29%7D%3D%5Cboxed%7B%5Cfrac%7B9n%2B10%5E%7B-n%7D-1%7D%7B27%7D%7D)
<u>Answer
</u>
Option B) 7 is the correct answer
FD = 7cm
<u>Explanation
</u>
Here triangle AEC. D is the midpoint of EC and F is the midpoint of EA
So D and F be the midpoint of triangle AEC.
FD be the midpoint joining line.
We know that if any triangle, line joining the midpoint of two sides is the half of the third side.
Here the third side is 14cm, then FD = 14/2 = 7cm
So option B) is the correct answer.
Upwards from 1 to 2 is your Answer (see attachments)
No entiendo....................
Answer:
46.5
Step-by-step explanation:
~A P E X~