+0  
 
0
46
1
avatar+389 

What is the integer value of x in the arithmetic sequence 3^2, x, 3^4?

 Apr 15, 2020
 #1
avatar+20812 
+1

Arithmetic sequence:  9, x, 81

 

The middle term of three consecutive terms of an arithmetic sequence is the mean of the outside two:

     x  =  ( 9 + 81 ) / 2   --->   x  =  90 / 2   --->   x  =  45

 Apr 15, 2020

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