Evaluate the following square root.
$-\sqrt{121}$

Simplify the following.

${}^7\sqrt{{(-x-1)}^7}$

Simplify the following.

${-}^8\sqrt{{(x+1)}^8}$

Evaluate the radical.

$\sqrt{{(-5)}^2}$

Evaluate the following square root.

$\sqrt{144}$

Determine if the given square root evaluates to a real number.

$-\sqrt{4}$

Determine if the given square root evaluates to a real number.

$\sqrt{-64}$

Determine if the given square root evaluates to a real number.

$-\sqrt{-25}$

Simplify the root.

${}^4\sqrt{256}$