Which system of equations has exactly one solution? O 2x - 4y = 8 X+y = 7 3x+y=-1 6x+2y = -2 3x + 3y = 3 -6x-6y=3 О 3x-2y = 4 -3x+2y = 4

What is the product of the radical expression. (7-2square root) (8+2 square root)

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

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?