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NO EXPLANATION NEEDED
I PUT IT DOWN AS 50 POINTS

11. 25

12. 60

13. 93

14. 46

15. 51

16. 85

#11

Complementary angles ad to 90°

#12

Alternate exterior angles are congruent

#13

Complete angle and angle addition postulate

#14

Vertical angles are congruent

#15

Complementary angles add to 90°. Straight angle is 180°

#16

Alternate interior angles are congruent

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°