If the sum of the product of deviations of x and y series from
their means is zero, then the
coefficient of correlation will be

Solve for x, y, and z. show all steps.

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?