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A. Solve the following.

1.) Find the 10th term of the geometric sequence 8,32,128,492, ...
2.) Find the eighth term in the geometric sequence 5,-10,20,-40, ...
3.) Find x so that the terms x-3, x+1 and 4x-2 form a geometric sequence.

B. Solve for the sum of the following arithmetic sequence.

1.) number between 1 and 81 which are divisible by 4
2.) First 20 terms of the arithmetic sequence -16,-20,-24, ...
3.) First 10 terms of the arithmetic sequence 10.2, 12.7, ​


Sagot :

Answer:

Common ratio is 4

(8,32,128,492,1968,7872,31488,125952,503808,2015232)