How do i graph this function. y=3x^2-8x

The complement of an angle is one-sixth the measure of the supplement of the angle. what is the measure of the complement angle?

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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