Need help asp practice test for unit 4

What is the value of x in the diagram below?

Which table represents a linear function? i'll give brainliest to first answer ^'^

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