Find the value of x. Please help

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 property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Which graph represents the linear function below? y-3=1/2(x+2)