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

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0