i need help with geometric series.. i keep putting questions, nobodys replied, can anyone help?

Question

anonymous · Answer

What are the questions?

anonymous · Answer

well basically everything on finding the sum for geometric series problems

anonymous · Answer

heres one...

anonymous · Answer

The temperature in Corning last week went from 8 degrees to 5 to 2 and the pattern continued for the next few days until the temperature was -13. Is this an example of an arithmetic or geometric sequence? and using the formulas, what is the total number of degrees the temp has decreased?

kirbykirby · Answer

This would be an arithmetic sequence.

You observe a common difference of "3" between the terms. If it was a geometric sequence, you could divide adjacent terms and find a common ratio.

anonymous · Answer

well i need help witih finding the sum of anything i guess not just geometric

anonymous · Answer

could you helpwith that question?

kirbykirby · Answer

Well the number of degrees it has decreased from 8 to -13, is 8 - (-13) = 21