The answer is 9.5 ( rounded, answer is 9.486833)
9) C.
10)A.
11) $75
Those are all the answers that you needed.
Answer:
The sum of the given series is 1023
Step-by-step explanation:
Geometric series states that a series in which a constant ratio is obtained by multiplying the previous term.
Sum of the geometric series is given by:
where a is the first term and n is the number of term.
Given the series: 
This is a geometric series with common ratio(r) = 2
We have to find the sum of the series for 10th term.
⇒ n = 10 and a = 1
then;

Therefore, the sum of the given series is 1023
Sum = 20(1-(1/4)^5) / (1-1/4) = 26.64