Plz help i cant figure out the second one

S-7< 3 i need answering this problem someone asap answer

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

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