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Please help me with these questions, thanks :)

 

#1

 

#2

 

#3

 

#4

 

I'm not at all good with sequences, so help with the above questions would be greatly appreciated. thanks

 Mar 21, 2019
 #1
avatar+111396 
0

First one :

 

an  = (2/5)(5)n - 1

 

Recursive rule  :   a1  = 2/5       an  =  5an-1 

 

 

Second one :

 

a1 = 2         an  =  (1/3)an-1

 

Explicit Rule :     an  =  2(1/3)n-1

 

 

Third one 

 

6, -18, 54, -162        [ note that the common ratio = -3 ]

 

Recursive Rule :    a1  = 6        an  =  (-3)an-1

 

 

 

Fourth one :  9, 6,  4, 8/3

 

The common ratio is   :     6 / 9    =  2/3

 

Explicit Rule :    an  = 6(2/3)n-1 

 

 

 

cool cool cool

 Mar 21, 2019
 #2
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+1

Thanks so much!!!

Guest Mar 21, 2019

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