find the common ratio of the sequence. -125, -25,-5,-1

Question

johnweldon1993 · Answer

how do you get from -125 to -25?

how do you get from -25 to -5?

how do you get from -5 to -1?

anonymous · Answer

divide by 5?

johnweldon1993 · Answer

Right....good idea starting with thinking about division.....just remember geometric series only use multiplication

so dividing by 5

is the same as

multiplying by ...?

anonymous · Answer

-164, -82,-41,-20.5,...so that would be dividing by 2 then

johnweldon1993 · Answer

yes that would be dividing by 2....except you would put you common ratio as 1/2 correct?

anonymous · Answer

oh the answer would be the fraciont 1/2 instead of just 2?

anonymous · Answer

fraction*

johnweldon1993 · Answer

that is correct....like I said before....geometric sequences only deal with multiplication....so like in that first question you asked...

multiplying by 1/5 is the same as dividing by 5....so your answer would be 1/5

and the same here...the answer would be 1/2

anonymous · Answer

oh i see thanks

johnweldon1993 · Answer

no problem!