I need to know if these are true or false

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?

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days

Prove that quadrilateral is a rhombus.