The probability of picking two black marbles from a box at random without replacement is 10/91 . the probability of drawing a black marble first is 5/14 . what is the probability of picking a second black marble, given that the first marble picked was black? 4/13 85/182 25/637 45/182

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