In Exercises 7–10, find the coordinates of the circumcenter of the triangle with the given vertices.
(See Example 2.)
7. L(3,-6), M(5,-3), N(8,-6)

You are studying for your final exam of the semester. up to this point, you received 3 exam scores of 67%, 68%, and 78%. to receive a grade of c in the class, you must have an average exam score between 70% and 79% for all 4 exams including the final.