Mrs. Long keeps 25 books on her shelf for her students to read. Six of the books are non-fiction. What percentage of the books is non-fiction?

24%

Step-by-step explanation:

6 divided by 25 is .24

∠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°

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