It's 21 square units. If you map it on a complex plane (x-axis is real numbers, y-axis is imaginary numbers) you'll see that the sides of the rectangle is 3 and 7 which multiply to 21.
When moving units to the right on a graph, it would be both. You would move it towards the positive side of the graph.
The correct answer would be A) X^6 Y^5
The domain of any polynomial is
.. all real numbers.