Algebraic form of the square of the sum of r and t.

If it’s the square root of the sum, this expression would be
square root symbol over(r+t)

All except for b, because polynomial functions can be quadratic, cubic, witticisms and etc only non negative exponents of negative it is not a polynomial function

Ithink the answer is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you