This cold river of air travels from west to east in the northern hemisphere. last winter, it dipped far south to bring cold air and snow to many southern states. this is the a) hadley wind. b) polar jet stream. c) arctic jet stream. d) tropical jet stream.

 The answer is polar jet stream because the polar jet stream dips low over the Northern United States during the winter to bring cold air. In the summer, the jet stream retreats and brings cool air to the Northern United States.

Explanation:

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles