Which of the following relations is a function? I. {(-2, 3), (2, -3), (4, -2), (-3,4)}
II. {(-2, 2), (4,3), (-3, 3), (-2, 4);
III. {(2, -3), (3,-4), (3, -3), (-4,4)}
IV. {(-4, 3), (-3, -3), (2, -3), (-2, -4)}
1. III, and IV only
I and IV only
II and III only
O I only

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