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5. Find a_6 of the geometric sequence: 4, 12, 36,...

 

Select one:

a. 243

b. 263

 

 

7. Find a_9 for the geometric sequence. 5, –20, 80, ...

 

Select one:

a. 327,380

b. 327,680

 Apr 12, 2019
 #1
avatar+111438 
+2

5.  The common ratio is 3   and the first term is 4

So

The 6th term is   4 (3) ^(6 - 1)  = 4 (3)^5  =  4 *243 = 972

 

 

6.  The common ratio is -4  and the first term is 5

So

The 9th term is    5 (-4)^(9 - 1)  = 5(-4)^8  = 327680

 

cool cool cool

 Apr 13, 2019

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