Help please!! This is hw and it’s due soon.

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?