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The first thing to note about this question is that it's a simultaneous equations question, involving a quadratic. We will have to use substution in order to solve it. So first of all we need to chose whi...

Hardwoods: oak, mahogany, maple, ash, birch, etc. Softwoods: pine, spruce, cedar, fir, etc. Disallow any manufactured boards, e.g. plywood, MDF, etc.

When you differenciate a function, the constant term turns to 0. So a lot of different functions like x² + 7 and x² - 3 will have the same derivative, this means that going from the ...