What is the area of a square whose perimeter is 16x + 28?

Apark is in the shape of a rectangle. the park authorities are planning to build a 2-meter-wide jogging path in the park (shown as the shaded region in the image). what is the area of the jogging path? plz

How do you solving the solution of each system using elimination?

The square root of 9x plus 7 plus the square rot of 2x equall to 7