Let x : R3 → R3
x(u, v) = (2(u - v) ,uv, 2(u+v)). Show that x is a proper patch

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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.

When you answer this can you explain