Aballon has a circumfrence of 11cm. use the circumference to approximate the surface are of the balloon to the nearest square centimeter! ! a 31 b 121 c380 d 154

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(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