{3x+4y=36 {y=-1/2+8 Solve this system of equations

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

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?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.