A cable will be installed from a farmhouse to a series of telephone poles. Part of the cable will be installed underground, D, with a cost of $260 per foot and part will be installed atop the telephone poles, L, with a cost of $30 per foot. Note: The total cost = the cost of installing along length L + the cost of installing along the length D. eng M₁ IL If M₁ | X D L 麦麦麦麦麦麦麦麦 M₂ = 400 feet and M₂ = 900 feet, determine the value of a that gives the minimum cost.

A cable will be installed from a farmhouse to a series of telephone poles. Part of the cable will be installed underground, D, with a cost of $260 per foot and part will be installed atop the telephone poles, L, with a cost of $30 per foot. Note: The total cost = the cost of installing along length L + the cost of installing along the length D. eng M₁ IL If M₁ | X D L 麦麦麦麦麦麦麦麦 M₂ = 400 feet and M₂ = 900 feet, determine the value of a that gives the minimum cost.

Elementary Algebra

17th Edition

ISBN:9780998625713

Author:Lynn Marecek, MaryAnne Anthony-Smith

Publisher:Lynn Marecek, MaryAnne Anthony-Smith

Chapter8: Rational Expressions And Equations

Section8.9: Use Direct And Inverse Variation

Problem 503E: The length a spring stretches varies directly with a weight placed at the end of the spring. When...

See similar textbooks

Similar questions

Find the slpoe of the line: y=7
Find the actual distance from Portland to Boise.
The length a spring stretches varies directly with a weight placed at the end of the spring. When Meredith placed a 6-pound cantaloupe on a hanging scale, the spring stretched 2 inches. How far would the spring stretch if the cantaloupe weighed 9 pounds?
In a classroom designed for 30 students, the air conditioning system can move 450 cubic feet of air per minute. (a) Determine the ventilation rate per child in a full classroom. (b) Estimate the air space required per child. (c) Determine the minimum number of square feet of floor space required for the room when the ceiling height is 30 feet.
Sue and Daves semicircular driveway is to be resealed, and then flowers are to be planted on either side. Give approximate answers. aWhat is the number of square feet to be resealed? bIf Dave can reseal the driveway at a cost of 0.45 per square feet, what is the cost of resealing the driveway? cIf individual flowers are to be planted 1 foot from the edge of the driveway at intervals of approximately 1 foot on both sides of the driveway, how many flowers are needed?