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April 16, 2014

April 16, 2014

Posted by **Anonymous** on Monday, May 30, 2011 at 8:42pm.

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 -
**Reiny**, Monday, May 30, 2011 at 9:27pmcost = 100+ 125 + 150 + ... for 9 terms

looks like an arithmetic series to me

a = 100

d = 25

n = 9

apply the sum formula

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