Iam confused with number6 someone show me the work and explain it for me !

What two criteria are needed for triangles to be similar

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?

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits