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65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

In the diagram of circle o, what is the measure of zabc?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.