At City Community College, every freshman must take English 101. The English department wants to know whether students who take this class in
their second semester get better grades than students who take the class in
their first semester. Which principle of experimental design can the English
department best use to include a variety of students in both the first and
second semester treatment groups of the study?

"curse these trig-loving pirates! " devora mutters as she looks at the map. then, after thinking for a moment, she walks back to the entrance of the secret cave, measuring 48 meters along the way. after performing a calculation, devora walks back to the empty treasure, faces the entrance, and turns a certain number of degrees to her left before walking 89 meters to the treasure. supposing that the angle at the cave entrance is acute and that devora's calculations were correct, how many degrees did she turn?