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April 16, 2014

April 16, 2014

Posted by **jazzmin** on Sunday, June 5, 2011 at 10:08pm.

the first 10 feet. After that, the cost of the labor for each succeeding 10 feet is $25

more than the preceding 10 feet. That is, the next 10 feet will cost $125, the next

10 feet will cost $150, etc. How much will it cost to build a 90-foot tower?

- math -
**MathMate**, Sunday, June 5, 2011 at 10:18pmThe cost is the arithmetic progression,

A(n)=A(1)+(n-1)d

where A(1)=100, d=25

and the sum to the nth term is

S(n)=(n/2)(A(1)+A(n)

For n=9 (90')

S(n)=(9/2)(100 + 100+(9-1)*25)

=?

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