Help please please ASAP please please help ASAP May god give what you want if you help me

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?

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

With alll of except for the 2 that i did already