A factory manager monitors the energy usage $x$ (in kilowatts) of a machine. For the machine to operate within safety guidelines, the usage must satisfy the compound inequality $\frac{2}{3}x - 4 \le 3$ or $\frac{1}{4}(x + 8) \ge -1$. Arrange the following steps in the correct logical order to determine the total range of safe energy usage.

A structural engineer is calculating the permissible stress levels for a bridge component. The component is considered safe if the stress level $x$ satisfies the compound inequality $\frac{2}{3}x - 4 \le 3$ or $\frac{1}{4}(x + 8) \ge -1$. According to the mathematical analysis of this requirement, which interval represents the entire set of safe stress levels?

A laboratory technician is monitoring the temperature $x$ (in degrees Celsius) of a chemical reaction. The reaction is considered stable if the temperature satisfies the compound inequality $\frac{2}{3}x - 4 \le 3$ or $\frac{1}{4}(x + 8) \ge -1$. True or False: This safety requirement means the reaction is stable at any temperature level, which is expressed in interval notation as $(-\infty, \infty)$.

A logistics coordinator at a regional distribution center is calibrating a weight sensor on a conveyor belt. The sensor is programmed to be active if the weight of a package $x$ (in kilograms) satisfies the compound inequality $\frac{2}{3}x - 4 \le 3$ or $\frac{1}{4}(x + 8) \ge -1$. Based on the mathematical analysis of these thresholds, match each component of the solution process to its corresponding result or description.

Universal Safety Thresholds in Logistics

An environmental health and safety officer is verifying the operational thresholds, $x$ (in hours), for an industrial backup ventilation system. The system's safety guidelines are governed by the compound inequality $\frac{2}{3}x - 4 \le 3$ or $\frac{1}{4}(x + 8) \ge -1$. Because the two inequalities are joined by the word 'or', the officer must find the ____ of the two individual solution sets to determine the complete range of safe operating hours.