How do you solve -3x - 2y = -13 and -5x -y = -17

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?

Solve the triangle. a = 21°, c = 105°, c = 5

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal