What kind of sampling technique is used when a customer service representative asks if you would like to take a brief survey after the call? explain your answer.

The highest common factor of 132 and 220

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

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