If k is negative, then the power function 
is a decreasing function for positive values of x.
Definitions:
Daily Lives
The everyday activities, routines, and experiences of individuals.
Japanese College Students
Individuals enrolled in higher education institutions in Japan, who may experience unique cultural, academic, and social environments.
American Students
A term typically referring to students who are citizens or residents of the United States engaged in educational pursuits.
Optimistic
A mindset characterized by a positive outlook on life and confidence in future success.
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