If ABCD is a rectangle, and m∠ADB=55°, what is the value of x?

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

Can someone me with this? i’m not sure what to put for my equations.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.