Can someone please show the work for 2/x = 13/39 (proportions) I already have the answer to it, I just need to do the work. Please help me, and thank you, have a nice day! (Will give brainliest and a heart)

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?

Which expression is equivalent to the expression shown?

Need asap. solve for the following inequality