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Read the passage below and solve the questions based on it.

*f*(*x*) is the area of a square where, *x* is the side of a square. *g*(*x*) is the perimeter of square where, *x* is the side of a square. *h*(*x, y*) is the area of a rectangle where *x* is the length and*y* is the breadth. *i*(*x, y*) is the perimeter of a rectangle where *x* is the length and *y* is the breadth.

The value of is equal to