HELP!! due in 20 minutes! i’ll give grain too

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?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?