Which discovery by astronomer Vera Rubin helped prove the existence of dark matter?

True or false.the baltic states have taken steps to diversify. or decrease the variety of their industries

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.

If the basis of an isosceles trapezoid have lengths of 11 and 26, what is the length of the median?