An island is 12 mi from the nearest point on a straight shoreline; that point is 15 mi from a power station (see figure). A Utility company plans to lay electrical cable underwater from the island to the shore and then underground along the shore to the power station. Assume that is costs $2400/mi to lay cable underwater and $1200/mi to lay underground cable. At what point should the underwater cable meet the shore to minimize the cost of the project? Write an equation for the total cost, C, as a function of x, where x is the distance from the shoreline closest to the island and the point where the cable leaves the shore. (Type an expression.) Island The interval of interest of the objective function is. Cable (Simplify your answer. Type your answer in interval notation.) 12 mi The cost is minimized when x is mi. Power Station (Type an exact answer.) 15 mi The minimum installation cost is $ (Round to the nearest cent as needed.)

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter59: Areas Of Rectangles, Parallelograms, And Trapezoids
Section: Chapter Questions
Problem 79A
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Question
An island is 12 mi from the nearest point on a straight shoreline; that point is 15 mi from a power station (see
figure). A Utility company plans to lay electrical cable underwater from the island to the shore and then
underground along the shore to the power station. Assume that is costs $2400/mi to lay cable underwater and
$1200/mi to lay underground cable. At what point should the underwater cable meet the shore to minimize the cost
of the project?
Write an equation for the total cost, C, as a function of x, where x is the distance from the shoreline closest to the
island and the point where the cable leaves the shore.
C =
(Type an expression.)
Island
The interval of interest of the objective function is
Cable
(Simplify your answer. Type your answer in interval notation.)
12 mi
The cost is minimized when x is
mi.
Power
Station
(Type an exact answer.)
15 mi
The minimum installation cost is $
(Round to the nearest cent as needed.)
Transcribed Image Text:An island is 12 mi from the nearest point on a straight shoreline; that point is 15 mi from a power station (see figure). A Utility company plans to lay electrical cable underwater from the island to the shore and then underground along the shore to the power station. Assume that is costs $2400/mi to lay cable underwater and $1200/mi to lay underground cable. At what point should the underwater cable meet the shore to minimize the cost of the project? Write an equation for the total cost, C, as a function of x, where x is the distance from the shoreline closest to the island and the point where the cable leaves the shore. C = (Type an expression.) Island The interval of interest of the objective function is Cable (Simplify your answer. Type your answer in interval notation.) 12 mi The cost is minimized when x is mi. Power Station (Type an exact answer.) 15 mi The minimum installation cost is $ (Round to the nearest cent as needed.)
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