Find m y
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34

Step-by-step explanation:

Set the two equations equal to eachother to find x=16. The measures of the two angles are 73. 73 times 2 equals 146. 180 minus 146 is 34.

∠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°