1. A rectangular area of has a wall as one of its sides. The two sides of the area that are perpendicular to the wall are made of chain-link fencing that costs $6 per meter. The side parallel to the wall is made of wooden fencing that is decorative because it faces the street and this fencing costs $8 per meter.

Express the total cost of the fencing, as a function of the length of the side perpendicular to the wall

Find the minimum cost.