98 points. (wont let me go to 100)

Step-by-step explanation:

4.x=15°

because the two angels are complementary.

5.z=137°

because Zis a liner angle

6. complementary angles

because the sum of the two angels are 90°

7. supplementary angle

because the sum of the two angels are 180°

8. neither

because the angels are same

hello there!

i believe the answer is

(cot2+1)/sec2=cot2

    csc2/sec2=cot2

  (1/sin2)/(1/cos2)=cot2

  (1/sin2)(cos2/1)=cot2

  cos2/sin2=cot2

  (1/tan2)=cot2

  (cot2)=(cot2)

hope this !

hyperz ^_^