Question 82644
Find the sum of the first 10 terms of the series defined by the formula: 
a(n) = -2n + 5 
-7,-9,-11,.....,-25
S(10) = 10/2(-7+-25)
S(10) = 5(-32)
s(10) = -160
a. 3 
b. 2 
c.-60 
d. -15 
Comment: Check your problem again.
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A 5 inch spike is being pounded in to a log. Every time you hit the hammer 1/4 of the remaining spike goes into the log. What kind of sequence or series is definied by the total distance the spike goes into the log? 

5, 5(1/4), 5(1/5)^2, 5(1/4)^3,....
Total distance in = 5^(1/4)^n where n=# of hammer strikes.

Geometric with a(1)=5 and r=(1/4)

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a. arithmetic sequence 
b. arithmetic series 
c. geometric sequence 
d.geometric series 

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Cheers,
Stan H.