arithmetic sequence a person hired a firm to build a cb tower. the firm charges $100 for labor for the first 10 feet. After that, the cost of the labor for each succeeding 10feet is $25 more than the proceding 10 feet.  That, is the next 10 feet will cost $12, the next 10 feet will cost $150, etc. How much will it cost to build a 90-foot tower.  

Expert Answers

An illustration of the letter 'A' in a speech bubbles

If I understand this correctly, the first ten feet is $100. This leaves 80 remaining feet to be built. If the initial part of your question is what the answer needs to be based upon, feet 11-20 will cost $125, 21-30 will cost $150, 31-40 will cost $175, 41-50 will cost $200, 51-60 will cost $225, 61-70 will cost $250, 71-80 will cost $275, and 81-90 will cost $300.

The entire tower will cost $1800. (This number is the sum of all of the different costs per 10 feet.)

Approved by eNotes Editorial Team
Soaring plane image

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial