Evaluate the exponential

Question

1. 125^1/3  

           a) 41.66667               b) 5                            c) 375                        d) 25

2.  – 16^3/2

           a) 64                          b) – 64                       c) – 12                        d)  Not a real number

3.  81 ^{– 3/2}

           a) – 729                      b)   -1/729                     c)  1/729                      d) 729

Answer 1

1. 125^1/3  means cubic root of 125; which is 5

 2.– 16^3/2 gives us square root of negative # which is Not a real number

3. 81 ^{– 3/2}; 81 ^{– 3} = 1/81³ = 1/531441;  81 ^{– 3/2} = is square root of 1/531441 = 1/729

hope that helps