Write a single algebraic term to represent the expression a+a+a

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?

Through non-collinear points there is exactly one plane.

Which equation represents h for right triangle abc