Which of the following systems of linear equations has no solution? x = 6 y = 4 x = 6 y = 6 y = 6 x = 4 none of the above

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