Please help me idk this

What is the least common multiple of 16 and 3?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?