1. Let us denote the length of the segment BC by x.
2. Determine the length of the segment AC:
4 * x = 4x cm.
3. Since the length of the segment AB is 15 cm, then we compose and solve the equation:
4x + x = 15;
5x = 15;
x = 15: 5;
x = 3.
4. The length of the BC segment is x = 3 cm.
5. What is the length of the speaker section?
15 – 3 = 12 cm.
Answer: the length of the AC segment is 12 cm.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.