Which sum or difference identity could be used to prove that sin(pie + q) = -sin q

Find the total area for the regular pyramid ( follow the answer set up in the picture)

Sara sells beaded necklaces she makes a profit of 4 dollars pn every neclace she sells which table represents the profit sara makes

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?