Drop ur snaps 14/15 (says I need it to be 20+ words)

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?

Anyone know? will mark brainliest if correct

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c