3(x-3y) i dont know hot to solve the question

What is the rotational symmetry of a wheel

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?