Question: A building plot has the shape of a rectangle whose length and width are represented by two variables X and Y. The ranges of these

A building plot has the shape of a rectangle whose length and width are represented by two variables X and Y. The ranges of these two variables are the intervals RX = [5, 8] and RY = [4, 6]. Let E be the area of the building plot.

(i) Find the range of values, RE, for this variable.

(ii) Explain whether each of the sets RX, RY and RE is countable.

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