21. if two angles are vertical angles, then which of the following is not true?
a. the angles are congruent
b. the angles share a common vertex
c. the angles lie in the same plane
d. the angles share a common side

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?

Select the correct answer and solve for y

Solve the following system of equations express your answer as an ordered pair in the format (a,b) with no spaces between the numbers of symbols 5x+2y=22