Please do not answer questions with spamming keyboards or with "I don't know" to get points. people legitimately are looking for answers to school problems, and it doesn't help the use of this app by spamming nonsense or by answering their questions with nonsense instead of helping them. I understand you want points but it can be extremely rude.

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I agree and also if you don't understand the problem or what exactly

it's asking don't put What do you mean as an answer but it in the comments of the question the persons asking.

∠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°