When a polygon reflects across the y-axis, how do the coordinates of the points change? a) the sign of the x-coordinate changes. b) the sign of the y-coordinate changes. c) the sign of both the x and y coordinates change. d) the x and y coordinates are switched and the signs of both change.

Stone mountain was formed during the formation of the blue ridge mountains around 300-350 million years ago and is considered part of the appalachian mountains. it formed as a result of the upwelling of magma from within the earth's crust. this upwelling, or solidified to form the that became stone mountain.