Math question need help.

—the graph shows how fast a strand of human hair grows. how many inches would the hair have grown in 5 months

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

X+ y = 5 ; x - y =3 solve using linear combination