find the sum for each geometric sequence a1=9,r=4,n=6
The formula for the sum of a geometric sequence is:
S = a1(1 - r^n) / (1 - r)
Plugging in the values given, we get:
S = 9(1 - 4^6) / (1 - 4)
S = 9(1 - 4096) / (-3)
S = -12267
Therefore, the sum of the geometric sequence with a1=9, r=4, and n=6 is -12267.