I need to know both of the questions please!

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?

Which of the following is the true for f(x) = 5cos

Find the area of an equilateral triangle with a side of 6 inches