What is 1-blank=0.015??? Plzzz help me :)

Which statements regarding the diagram are true? check all that apply.

What is the equation of the graph below? y=sec(x)-4

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?