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The recursive rule for a sequence is shown.
an = an−1 + 9
a1 = 21
 
What is the explicit rule for this sequence?
 
A) an = 12n − 9

B) an = 9n + 12

C) an = 12n + 9

D) an = 9n − 12

 
Jaleco  Apr 13, 2018
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 #1
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The difference between terms is 9

 

Consider  "C"

 

a1  = 12(1)  +  9   =  21  

 

So.....this must be the correct choice

 

 

cool cool cool

 
CPhill  Apr 13, 2018

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