CAN SOMEONE PLEASE HELP ME SOLVE THESE?! :D

What are the values of m∠abc, m∠cbf, m∠abd and m∠dbe in the given figure? explain or show your work?

If jm equals 5x -8 and lm equals 2x -6 which expression represents jl

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?