Answer:
Sum = 
Step-by-step explanation:
The given geometric sequence is:

The first term of the sequence is 
The common ratio of the sequence is:

There are 5 terms in total in the given sequence so n = 5
The formula to calculate the sum of finite geometric sequence is:

Using the given values, we get:

Therefore, the sum of given geometric sequence is 
Answer:
..........................do..................that......
Step by Step: Solve the parentheses first then add that should then give you your answer
" of " means multiply
1/4 * 3.20/1...and just multiply....(1 * 3.20) / (4 * 1) = 3.20/4 = 0.8
or
1/4 = 0.25.....0.25(3.20) = 0.8