How do i find the volume of an l-block?

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

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?

Find the area of the triangle shown 3 by 6