show how to solve the average-case recurrence for quicksort

Which are steps taken to diagnose a computer problem? a) reproducing the problem and using error codes b) reproducing the problem and troubleshooting c) using error codes and troubleshooting d) using error codes and stepping functions

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health? a. air quality data gathered by new instruments can be used to reduce exposure to pollutants. b. new technologies enable natural and human-made pollution sources to be located and monitored. c. air quality data gathered by new instruments can be used to predict trends in pollution over time. d. new technologies allow governments to make informed decisions about the regulation of pollution. (choose more than one)

What are two of the most common reasons that peolpe who need mental health care do not access it?