Which of the triangles are right triangles

Two parallel lines are crossed by a transversal.what is value of x

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

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