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The answer says f(6)= -6We know that the area above ( from 0 to 2 ) and below (from 2to 4) is equal so that means that the function=0 at this point. Now to calculate f(6), just take the area between x=4 and x=6. It's a rectangle that comes out to be 6u^2. That means f(6) = 0
notice f'(6) = -3The answer says f(6)= -6