Standing on one bank of a river, an explorer measures the angle to the top of a tree on the opposite bank to be 27 degrees. he backs up 50 feet and measures the angle to the top of the tree to now be 22 degrees. how wice is the river? round to the nearest tenth of a foot.

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.