The cost of laying power line underwater is 3 times that of underground. An island is 4 km from the shore and a power station is at distance 8 km from the point on the shore which is closest to the island. How should the power line be laid so that the cost is minimum

Start underground at the power station, and go underwater for the 4km from the shore.

Step-by-step explanation:

The total number of km is 12.

An expression for this is: 3x + x

x stands for the cost of laying power line underground.

hi! i think the answer is 1/2 : )

step-by-step explanation:

for the free