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Help#1

NotSoSmart  Mar 12, 2018
 #1
avatar+91297 
+1

1.  No...in a geometric series.the ratio between the successive term to the previous term must be constant ....note that

 

-4 / 2   =   -2

But

-16 / - 4  =  4    so....not geometric

 

2. Fifth term  

The common ratio  is  36/120  =  3/10

So....the fifth term is

 

First Term * (Common Ratio)n-1   =

 

120 (3/10)5-1  =

 

120 (3/10)4   = 

 

 0.972

 

 

cool cool cool

CPhill  Mar 12, 2018

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