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The perimeter of a rectangle is found by adding up all the sides.
In this case, the length of the rectangle is 14 - (-10) = 24 units, and the width is 2 - (-22) = 24 units.
So, the perimeter is 2*24 + 2*24 = 96 units.
Therefore, the perimeter of the classroom in feet is 96 feet.
The answer is: 96 feet