Amath club took a math test. twelve of the members had an average score of 80. eighteen of the members had an average score of 86. what was the class average? enter your answer in the box.

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Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units