Problem 16: In triangle ABC, M is a point on BC and N is a point on AC. BN is perpendicular to AC and MN is perpendicular to AB. If BC = 8. What is the length of AC?

Unfortunately, I cannot solve this problem with the information provided. The image shows a triangle ABC with M on BC and N on AC. BN is perpendicular to AC and MN is perpendicular to AB. We are given BC = 8. However, there is no clear relationship between BC and AC, and the perpendicular lines create right angles that do not seem to directly lead to the length of AC with the given information.