Find a parametric representation for the surface. the part of the hyperboloid 4x2 − 4y2 − z2 = 4 that lies in front of the yz-plane. (enter your answer as a comma-separated list of equations. let x, y, and z be in terms of u and/or v.)

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

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?

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90