1.) A rectangular field is to be enclosed on all four sides with a fence. Fencing material costs $3 per foot for two opposite sides, and $6 per foot for the other two opposite sides. Find the dimensions of the field with area 720 square feet that can be enclosed for $2400
2.) A park in the shape of a rectangle has dimensions 60 m by 100 m. If the park contains a rectangular garden surrounded by a concrete terrace of uniform width, how wide is the terrace if the area of the garden is one-half the area of the park?
