Homework Help: math

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

. A person hired a firm to build a CB radio tower. The firm charges $100 for labor for
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 10:18pm
The 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)
=?

Answer this Question

Related Questions

math - A person hired a firm to build a CB radio tower. The firm charges $100 ...
math - A person hired a firm to build a CB radio tower. The firm charges $100 ...
math - 35. A person hired a firm to build a CB radio tower. The firm charges $...
arithmetic - need a reinstatement A person hired a firm to build a CB radio ...
mathematics - a person hired a firm to build a cb radio tower. the firm charges...
math - A person hired a fire to build a CB radio tower. the firm charges 100 for...
Math - Can you please explain step by step on how to do each of these two ...
economics (micro) - 2. In the table below, assume a monopsonist has the marginal...
Microeconomics - The labor demand curve of a purely competitive seller: What ...
Math/Economics - Suppose that a firm has only one variable input, labor, and ...

For Further Reading

First Name:
School Subject:
Answer: