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Let A be a matrix that scales the 2D XY plane VERTICALLY by a factor of 2 (which means, everything becomes twice as big

Let A be a matrix that scales the 2D XY plane VERTICALLY by a factor of 2 (which means, everything becomes twice as big along the Y axis, while remains the same along the X axis). What is the number that sits at the first row and first column of the matrix A?

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