exam Maths Puzzle Numerical Ability

Geometry. The length of a rectangle is 2 inches more than twice its width. If the perimeter of the rectangle is 34 inches, find the dimensions of the rectangle.

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-15+-3+9+21+33+45+57+69+81+96 I have a homeowrk question that states: find the maximum revenue for the revenue function R(x)=490x-0.07x^2. How do I work this problem out? I have tried everything.