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bonjour pouvez vous m'aider à mon dm de math? x denotes a number greater than 3. Here is a rectangular parallelepiped whose dimensions are given in cm. 4x 2x x+5 Express as a function of x the total area A, in cm², of its six faces. 2. Verify that this area A is equal to twice the area of a rectangle of dimensions 2x and 7x+15.​