Anyone Mind Helping me with This? (Picture Provided)

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

What situation is an example of an observational study

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form