Find the four second partial derivatives. Observe that the second mixed partials are equal.

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.

Jenny made a scale drawing of a city. the scale she used was 5 inches = 1 yard. what is the scale factor of the drawing?

Given that (6,9) is on the graph of f(x), find the corresponding point for the function f(x - 2). enter the correct answer.