Geometry question help!!

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

The measure of an angle is 117°. what is the measure of a supplementary angle?