How do you find the surface area of a shape that has a variable

The rectangular prisim has a length of 11 in, a width of 3 in, and a height of x.
in order of operations by

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The answer is in algebraic form. A rectangular prism has 6 surfaces, and if L, W and H represent length, width and height, the sum of the surface areas (which can be arranged in pairs of opposite faces with the same area)=2(LW+LH+WH)=2(33+11x+3x)=2(33+14x)=66+28x.

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