joseruv joseruv

12-12-2016
Mathematics

Answered

whaT is the sum of the first 6 terms of this geometric system

-5,10,-20,40,...

Verified Answer :

HyperDrive HyperDrive

12-12-2016

Each one is multiplied by -2...

PROOF
-5 10 = -20
-20 -2 = 40
And so on.

So we need two more numbers so do 40 -2...

40 -2 = -80

And then...
-80 * -2 = 160

So the first 6 numbers are...
-5, 10, -20, 40, -80, 160.

We need to find the SUM, which is all the numbers added together.

-5 + 10 - 20 + 40 - 80 + 160 = 105

105 is your answer.

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