Find the solution (if any) to the equation. $\sqrt[4]{3x}+\sqrt[4]{x+7}=0$

A) x= $-\frac{7}{4}$
B) x=-4
C) $x=$ $\frac{7}{2}$
D) $x=0$
E) no solution

Find the principal square root of $\sqrt{-25}$ , if possible. Do not use a calculator.

A) 5
B) 25,-25
C) -5
D) $\sqrt{5},-\sqrt{5}$
E) no real roots