What is the area of the shaded region in the given figure?  Round to the nearest hundredth.

During the summer, many towns experience an increase in wildfires. Hot temperatures, dry conditions, and strong winds create ideal circumstances for fires to start and spread quickly. As a result, local authorities often impose fire bans and urge residents to be cautious when using grills or disposing of cigarette butts. Communities that prepare in advance by clearing dry brush and maintaining firebreaks tend to experience less damage when wildfires occur.

What is the cause-and-effect relationship described in the paragraph?

Many people who do not get enough sleep often feel tired and have difficulty concentrating the next day. Lack of sleep weakens the immune system, making it easier to get sick. Students who stay up late studying or using electronic devices may find that their grades drop because they cannot focus during class. Employers have noticed that workers who are consistently sleep-deprived make more mistakes and are less productive.

What is the cause-and-effect relationship described in the paragraph?