Name an angle that is congruent to angle 2

Which statement best describes how chemical equations demonstrate conservation of mass?

The nations of indochina a. share a common langauge b. share a common history c. share a common religion d. none of the above

The next best alternative given up when making a choice is called the a. opportunity cost b. comparative advantage c. primary objective d. negative consequence select the best answer from the choices provided. a b c d