wizkids08 wizkids08

29-05-2017
Mathematics

contestada

PLEASE EXPLAIN

The 4th term in a geometric sequence is -15, the 5th term is 45 and the 6th term is -135. Find the sum of the first 7 terms.

a) -105
b) -101 1/9
c) 305
d) 303 8/9

Respuesta :

ghanami ghanami

30-05-2017

hello here is a solution :

Ver imagen ghanami

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