Please provide a solution its urgent

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

What properties allow transformation to be used as a problem solving tool

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