Ateacher gave students seven questions and wrote that she would randomly choose one of the seven questions for an exam. if harry prepared for only one of the questions, what is the probability that he did not study for the question that the teacher put on the exam?

"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?