One can determine an event based on a given concept by first understanding the key elements and characteristics of the concept. Then, one can look for specific occurrences or instances that align with those elements and characteristics. It is important to consider the context and surrounding factors to accurately determine if an event fits the given concept. Additionally, using evidence and data to support the connection between the event and the concept can help in determining the relevance of the event to the concept. **

To determine the last access to an external hard drive, you can check the file system's metadata for the last access timestamp. This information can typically be found by viewing the properties of the drive or individual files on the drive. Additionally, you can use specialized software or tools that can provide more detailed information about the access history of the external hard drive. Keep in mind that some operating systems or file systems may not track last access times by default, so the accuracy of this information may vary. **

If a person does not have a personal identification card, the police can use other methods to determine his identity. They may ask the person for their name, date of birth, and address, and then cross-reference this information with databases and records to verify their identity. Additionally, the police may take the person's fingerprints or use facial recognition technology to identify them. In some cases, they may also ask for identifying information from witnesses or other individuals who may know the person in question. **

Festival wristbands with metal closures may set off metal detectors during airport security checks. In this case, security personnel may ask the individual to remove the wristband before passing through the metal detector. It is recommended to remove any items that may trigger the metal detector to ensure a smooth and efficient security screening process. **

Extrema of a function can be determined by finding the critical points where the derivative is equal to zero or undefined. These critical points are then evaluated to determine if they correspond to a maximum or minimum value. Additionally, the endpoints of the interval being considered should also be checked to see if they are extrema. By analyzing the critical points and endpoints, one can determine the extrema of a function. **

I'm sorry, but I am not able to determine x without more context or information. Please provide me with more details or a specific equation or problem to solve. **

Norms determine the accepted behaviors, beliefs, and values within a particular group or society. They dictate how individuals should act, think, and interact with others in order to be considered as part of the group. Norms also influence social expectations and help maintain order and cohesion within a community. Additionally, they play a significant role in shaping cultural identity and defining what is considered as appropriate or inappropriate within a given context. **

To determine the base b, you need to look at the context in which it is mentioned. The base b is typically used in mathematical expressions involving exponents or logarithms. In an exponential expression like b^x, the base b is the number being raised to a power. In a logarithmic expression like log_b(x), the base b is the number that the logarithm is taken with respect to. Identifying the base b is crucial for understanding the relationship between the numbers in these mathematical operations. **