Find the value of each variable in the circle to the right

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?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Write the equations in logarithmic form 7^3=343