there are two real solutions if the radicand is

Can someone answer this question? : )

Benito is selecting samples of five values from the table, which row will result in the greatest mean? population data row 1 4 2 2 3 3 row 2 3 3 4 3 2 row 3 2 4 3 4 3 row 4 3 4 4 7 3 row 1 row 2 r

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8