Im running out of !

which of the following radical expressions has an absolute value symbol in its simplified form?

i hope i wrote these right

my choices are:
a. 16x^4√4
b. 81x−−−√4
c. −125x^3√3
d. 64x^3√3

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Which of the following is the correct ratio for converting kilograms to grams

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33