Answer:
C
Step-by-step explanation:
The standard form for the explicit formula of a geometric sequence is given by:

Where a is the initial term, r is the common ratio, and n is the nth term.
Our sequence is: 8, 4, 2, 1...
So, we can see that our initial term or a is 8.
Each subsequent term is half of the previous one. So, our common ratio is 1/2.
Let's substitute 8 for a and 1/2 for r to acquire:

So, our answer is C.
And we're done!
Answer:
0.4476
Step-by-step explanation:
50 becacause there is 27 and you need to add it all together
Answer: 3
Step-by-step explanation: