What is the missing number in the table

What is the sum of the first 8 terms of the geometric series

7th grade angle relationships and geometry test, what do i need to study my last math test is tomorrow i need to pass tomorrow this is the review sheet

Tell whether the sequence is arithmetic, geometric, or neither. find the next three terms of the sequence. a. neither; 7, -20, 61 b. geometric; 7, -20, 61 c. arithmetic; d. geometric;