When you are 1.5 meters away from the speakers at a concert, the sound level is 130 db. How far away should you sit to reduce the level to 70 db? First calculate the db difference then take the square root of that value and multiply by the original distance

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.