A technician is analyzing an electrical circuit where the impedance is represented by the complex number ${}15 - 8i$ ohms. According to the standard definition of a complex number in the form $a + bi$, which value is the imaginary part?

A telecommunications specialist is analyzing a signal's phase, which is represented by the complex number ${}24 - i$. According to the standard form $a + bi$, the numerical value of the imaginary part of this signal is ____.

An HVAC technician is using a diagnostic tool to measure the electrical load of a system. The tool displays the circuit's impedance as the expression ${}22 - 9i$ ohms. Match each part of this measurement to its correct mathematical designation based on the standard form $a + bi$.

HVAC Vibration Analysis Log

An avionics technician is programming a navigation system using the mathematical expression ${}14 - 9i$ (in the standard form $a + bi$). The imaginary part of this expression is the real number $-9$.

Acoustic Filter Configuration

A field technician measuring the impedance of an AC electrical system obtains a reading of `${}12 - 5i$ ohms. To log this data correctly in the maintenance software, the technician must identify and extract the imaginary part of this complex number. Arrange the steps of the identification process in the correct chronological order.