Find the median and mode of the data: 11,17,7,6,7,4,15,9

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

Two airplanes start at the same place and travel in opposite directions, one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Could someone me with this question i’ve been stuck on it for 20 minutes