Solve using elimination.
4x + y = -5
8x + 3y = -19

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Acone with volume 1350 m³ is dilated by a scale factor of 1/3. what is the volume of the resulting cone? enter your answer in the box. m³

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?